Her Hemoglobin Is Normal. Is Her Iron? What NPs Should Know About Iron Deficiency Before Anemia

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A 34 year old man comes in because his workout suddenly feels harder.
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He is a recreational runner, he eats well, he sleeps reasonably well, and he has no obvious illness.
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He tells you I can still do everything I used to do, it just takes more out of me now.
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His CBC is normal, hemoglobin is normal, MCV is normal, he has already been told there is no anemia, so iron is not really a problem.
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Then you ask one more question. Do you donate blood? He says every eight weeks, I have for over a year.
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You check ferritin and transferrin saturation, his iron stores are depleted.
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Now consider a completely different patient. She is 47, her periods have become heavier and less predictable.
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She is tired, her hair is shedding, and she has restless legs at night. Her hemoglobin is also normal.
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Someone has already told her the fatigue is probably perimenopause.
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Two patients, two very different stories, the same clinical trap.
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We have been trained to recognize iron deficiency anemia, but iron deficiency does not begin the day hemoglobin drops below the reference range.
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And this is where integrative medicine can make us better clinicians or send us too far in the other direction.
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Because missing iron deficiency before anemia is a problem, but so is deciding that every ferritin below 70, 100, or whatever number is trending online needs aggressive replacement. So today we're going to get very practical.
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How do you recognize iron deficiency before anemia? Which markers actually matter?
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How does inflammation change ferritin? When should you think about blood loss, malabsorption, diet, or increased demand?
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What do we usually know about fatigue, restless legs, and hair loss?
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And once you find low iron, how do you replace it without forgetting the most important question of all?
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Why did this patient become iron deficient in the first place?
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Welcome back to The Integrative Clinician. I'm Dr.
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Sheri Erwin, nurse practitioner, educator, and founder of BridgeWell Integrative Education.
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This show is for nurse practitioners who want to practice differently, not by abandoning conventional medicine and not by collecting more protocols, but by learning how to connect physiology, question assumptions, and make the next clinical decision more intentional.
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Today we are talking about iron, and I want to start with a distinction that sounds simple but changes the entire conversation.
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Iron deficiency and iron deficiency anemia are not the same diagnosis.
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Anemia is a later consequence of iron deficiency in many people. Iron stores can fall first.
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Hemoglobin can remain within range while the patient is already iron depleted.
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That state is often called non-anemic iron deficiency.
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That does not mean every patient that's tired with normal CBC needs iron.
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It means the CBC answers one question and iron status answers another.
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So instead of giving you another list of optimal laboratory ranges, I want to walk you through the way I think about iron clinically.
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Recognize, confirm, interpret, find the why, replace, and reassess. Six steps, but one continuous clinical story.
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So let's look at step one. This is the recognize the story before you chase the number.
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Let's go back to the runner from the opening statement. What made iron worth considering?
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It was not that he was male or female, it was not that he looked pale. It was not that his hemoglobin was low.
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It was the combination of declining exercise tolerance and repeated blood donation.
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Iron is central to oxygen transport, but its biology extends beyond hemoglobin.
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It is involved in myoglobin, mitochondrial enzymes, cellular energy metabolism, and neurological functions.
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So it makes physiological sense that a depletion can matter before a patient meets criteria for anemia.
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The mistake is assuming symptoms are specific. They are not. Fatigue can be iron deficiency. It can also be sleep apnea, hypothyroidism, depression, infection from side effects of medications, underfueling, overtraining, cardiopulmonary disease, metabolic dysfunction, or 50 other things. Hair shedding is not an iron diagnosis.
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Restless legs is not an iron diagnosis. Exercise intolerance is not an iron diagnosis.
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These symptoms, however, raise questions. So when does iron move higher on my differential?
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I look for a story of loss, inadequate intake, impaired absorption, or increased demand.
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Loss might be heavy menstrual bleeding, it might be gastrointestinal blood loss, it might be repeated blood donation, it might be surgery, and it might be frequent phlebotomy in a patient with chronic disease.
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Inadequate intake may occur in someone with highly restrictive diet, food insecurity, very low total intake, or a dietary pattern that contains little bioavailable iron.
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Impaired absorption changes the story again.
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Celiac disease, inflammatory bowel disease, bariatric procedures, and other gastrointestinal conditions that matter regarding absorption.
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So the other thing to consider is acid suppression and other factors that affect absorption.
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And increased demand matters.
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Pregnancy is an obvious example, but endurance training can also complicate iron balance through several mechanisms.
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Here's the question I want you to ask before you order anything.
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What in this patient's story makes iron deficiency plausible?
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The question protects us from both undertesting and over-testing.
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Step two, confirm iron status, not just anemia.
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Now, let's talk about the labs because this is where the conversation often gets muddy. A CBC is useful.
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Hemoglobin tells us whether anemia is present.
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MCV and other red cell indices can give us clues, but a normal CBC does not prove that iron stores are adequate.
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Ferritin is usually the most useful single marker of iron stores. When ferritin is clearly low, that is meaningful.
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Major guidance recognizes ferritin below about 15 micrograms per liter as highly specific for depleted stores.
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And values below 30 are generally consistent with low iron stores in otherwise healthy adults.
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But ferritin has a personality problem. It is also an acute phase reactant.
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That means inflammation can push ferritin upward.
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A patient can have iron-restricted physiology while ferritin looks less concerning than you expected.
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This is why I do not interpret ferritin in isolation when the clinical context suggests inflammation or chronic disease.
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Transferrin saturation can help, so can the rest of the iron panel and when appropriate, inflammatory markers.
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In selected settings, reticulocyte, hemoglobin, or soluble transferrin receptor can add information, although availability varies and they are not necessarily appropriate for every patient.
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This is also where I want to separate evidence from internet medicine.
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You will hear people say ferritin must be above 50 or 70 or 100.
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Sometimes those numbers are borrowed from a specific clinical context and then generalized to everyone.
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That is not how I want you practicing. There is a difference between a diagnostic threshold, a laboratory reference interval, and a disease-specific treatment target and an optimal number, someone posted on social media.
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For example, iron management in chronic kidney disease is not interpreted the same way as iron status is in an otherwise healthy adult.
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Restless legs has its own iron treatment considerations. Pregnancy is different.
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Inflammation changes interpretation as well. So I do not ask what is the perfect ferritin number.
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I ask, what does this ferritin mean in this patient with this history and these symptoms, this transferrin saturation, and this inflammatory context?
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a ferritin of 35. Is this really a diagnosis?
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Let's make this uncomfortable for a minute.
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A patient comes in with fatigue and a ferritin of 35, a hemoglobin level that's normal.
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Someone online told them their ferritin should be at least 100, and that this explains every symptom that he's had.
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What do you do? First, do not dismiss them.
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There is randomized trial evidence that some non-anemic menstruating women with fatigue and low or borderline ferritin improve with oral iron.
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That is a real set of evidence.
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But it does not prove that every person with a ferritin of 35 is symptomatic because of iron.
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It does not establish 100 as a universal treatment target, and it does not eliminate the rest of your differential.
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This is where functional medicine sometimes takes a useful observation and turns it into a universal rule.
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I want us to resist that. Ferritin values can strengthen or weaken a hypothesis.
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They should not replace clinical reasoning.
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And if you decide to treat, the response becomes another piece of information. Did the symptoms improve?
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Did the laboratory markers respond? Did the presumed source of deficiency change?
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The goal is not to win an argument about the perfect ferritin. The goal is to understand the patient.
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Now let's move into the third step, the interpretation of patterns.
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Now imagine a 62-year-old man with a ferritin of 18 and a normal hemoglobin.
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That is not the same clinical story as a 28-year-old menstruating woman with heavy periods and a ferritin of 18.
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The number may be the same, the implication is not. This is one of the reasons I dislike protocol medicine.
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Protocol C numbers. Clinicians see context.
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In the younger patient with heavy menstrual bleeding, the source may be obvious enough to guide the first part of the evaluation.
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Although we still need to understand why the bleeding is heavy and whether anything else is contributing. In a man, a postmenopausal woman, or anyone with gastrointestinal symptoms, unexplained iron deficiency should make you think differently about occult blood loss or gastrointestinal pathophysiology.
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Non-anemic iron deficiency anemia carries a lower malignancy risk than iron deficiency anemia, but it still deserves thoughtful evaluation based on age, sex, symptoms, family history, and the rest of the clinical picture.
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Celiac disease deserves special attention when iron deficiency is unexplained or reoccurrent.
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Iron deficiency may be one of the ways it presents, even when the patient is not walking in complaining of dramatic diarrhea.
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And then there's inflammation.
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Imagine ferritin is 90, but transferrin saturation is low and the patient has active inflammatory disease.
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Is iron status automatically fine because the iron is 90? The answer is no.
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Inflammation can increase ferritin and alter iron handling through hepcidin.
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Hepcidin is worth understanding because it helps connect the physiology.
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It is produced primarily by the liver and acts as a central regulator of systemic iron availability.
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When hepcidin rises, intestinal iron absorption falls and iron becomes less available from storage sites.
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That is part of why chronic inflammatory states can create iron-restricted erythropoiesis, even when total body iron stores are not straightforwardly depleted.
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This is the kind of physiology I want integrated clinicians to understand.
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Not because we need to order a hepcidin level on everybody.
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We usually do not, but because understanding the mechanism helps us interpret the labs we already have.
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Now let's move into the step four. Find the way. This is the part of the episode I care about the most.
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Finding low iron is not the end of the workup. It is the beginning of a new question. Why?
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If you replace iron without understanding why the patient became deficient, you may temporarily improve the number while leaving the actual problem untouched.
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That is not root cause medicine. That is replacement therapy without a diagnosis. Let's take four patients.
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Patient one is 46 and menstruating. Over the last year, cycles have become irregular and sometimes extremely heavy.
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She has fatigue and restless legs. Her hemoglobin is normal and her ferritin is low.
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This is where the hormone episode and iron episode intersect.
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Perimenopause may be relevant, but not because estrogen explains every symptom.
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The menopausal transition may have changed her bleeding pattern, and the bleeding may have depleted iron.
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Now the hormone story and the iron story are connected.
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Patient two is a 34-year-old man, blood donor, and endurance athlete.
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He has no gastrointestinal symptoms, but he donates frequently and has increased his running volume.
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His story points towards repeated loss plus demand.
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Patient three is 55, does not menstruate, and has newly identified iron deficiency.
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That patient deserves a different threshold for investigating in gastrointestinal blood loss and other pathology.
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Patient four has recurrent low iron despite taking supplements.
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Now I want to know whether the issue is adherence, tolerance, dose, timing, ongoing loss or absorption.
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Is there celiac disease, inflammatory bowel disease, prior bariatric surgery, ongoing bleeding?
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Is this patient taking the iron in a way they can actually tolerate and absorb it?
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Notice how different those four treatment plans become, even though all four patients can have the same word in the chart, iron deficiency.
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This is why the why matters. What about diet?
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Now let's bring nutrition into this because integrative medicine should absolutely care about food, but we need to be precise about it.
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Dietary iron exists in heme and non-heme foods. Heme iron from animal food is generally more bioavailable.
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Non-heme iron from plant foods can still contribute meaningfully, but absorption is more variable and is influenced by the rest of the meal.
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For example, vitamin C can enhance non-heme iron absorption.
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Calcium, tea, coffee can reduce absorption under some circumstances.
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That does not mean your patient needs a rigid food timing spreadsheet for the rest of their life.
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It means that if someone is struggling to restore iron, the details matter. And please look at the total intake.
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A patient eating 1,000 calories a day, avoiding red meat, avoiding legumes because of bloating, avoiding fortified grains because they are processed, and drinking coffee through lunch may not need an exotic explanation for inadequate iron intake.
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Sometimes the functional medicine diet itself becomes part of the problem.
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That is an uncomfortable conversation, but an important one.
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If our attempt to create a clean diet leaves the patient underfueled and micronutrient deficient, we have not improved their physiology.
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Food should expand health, not become another source of fear.
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Let's look at hair loss. How far should we take the iron story?
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Now we need to talk about hair because this is where ferritin conversations become especially intense.
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A patient comes in with diffuse hair shedding and a ferritin of 28.
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They have already been told online that their ferritin must be 70, 80, or 100 before their hair can grow.
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Could iron deficiency contribute to hair shedding? The answer is yes.
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Iron deficiency belongs in the evaluation of diffuse hair loss when the story supports it, but the evidence does not justify turning one ferritin target into a universal hair growth prescription.
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Hair loss has a differential.
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It could be coming from thyroid, it could be from stress, medications, nutrition deficiencies, rapid weight loss, autoimmune disease, a hundred other causes.
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So if ferritin is clearly low, correct the deficiency, but do not promise that driving ferritin to an arbitrary number will restore every patient's hair.
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Again, we are treating the patient, not chasing the biomarker. Restless legs, a different clinical context.
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Restless legs is different because iron has a particularly important role in the clinical evaluation and management of restless leg syndrome.
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Specialty guidance uses iron measures, including ferritin and transferrin saturation, to help determine when iron therapy may be appropriate.
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And the thresholds used in restless leg are not identical to the thresholds we use simply to diagnose depleted iron stores in healthy adults.
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That distinction matters.
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A disease-specific treatment threshold should not automatically become the optimal ferritin for every patient in primary care.
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This is exactly how numbers get distorted when they move from one clinical context into social media.
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So when a patient has restless legs, I take the symptoms seriously, evaluate iron status appropriately, and use the disease-specific evidence.
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I do not generalize that target to everyone else.
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So look at step five, replace iron intentionally.
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Now we have confirmed iron deficiency, interpreted the pattern, and investigated the likely cause.
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What do we do about replacement?
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For many patients, oral iron is a reasonable starting point, but more iron is not always better.
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Traditional prescribing often used multiple daily dosing.
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We now understand more about hepcidin, physiology, gastrointestinal tolerance, and absorption.
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Current expert guidance generally favors oral iron no more than once daily, and every other day dosing may be better tolerated for some patients with similar or adequate absorption.
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This is a meaningful shift because adherence matters.
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The perfect dose that your patient stops taking after four days because of nausea and constipation is not an effective treatment.
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I also want you to pay attention to elemental iron rather than just the number printed on the front of the bottle.
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Different iron salts contain different amounts of elemental iron. Ferrous sulfate is inexpensive and commonly used.
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Other formulations may be better tolerated by some patients, but gentler does not automatically mean more effective, and expensive does not automatically mean superior.
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Vitamin C is often paired with iron.
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It can enhance non-heme iron absorption physiologically, although routine supplemental vitamin C with every iron dose is not necessary for every patient.
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If someone is taking oral iron, I also ask about practical details.
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Are they taking it with coffee, with calcium, with a meal because otherwise they vomit? Or are they constipated already?
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Are they actually taking it?
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Sometimes optimizing a regimen means accepting slightly less theoretical absorption in exchange for a plan that a patient can actually follow.
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And sometimes oral iron is not the right tool. Intravenous iron becomes relevant when oral iron is not tolerated, when ferritin does not improve despite an adequate oral trial, when absorption is unlikely, or in specific clinical settings where IV therapy is preferred.
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Bariatric surgery that disrupts duodenal absorption is one important example in current gastroenterology guidance.
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IV iron is not a wellness upgrade. It is a medical therapy with indications, monitoring costs, and potential reactions.
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At the same time, we should not treat it as something inherently dangerous or exotic when it is clinically indicated.
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The goal is appropriate route, appropriate dose, and appropriate patient. The supplement trap.
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This is also where I want to challenge something I see in integrative practice.
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A patient has low ferritin, so we add iron, then vitamin C, then lactoferrin, then a digestive enzyme, then liver capsules, then a mineral complex.
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Suddenly the patient is taking six products to treat a problem we still have not explained.
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Supplements can be useful, but supplement stacking is not clinical reasoning. Before you add a fourth product, ask whether the first intervention had enough time, whether the patient is taking it, whether the absorption is impaired, and whether ongoing blood loss is outpacing replacement.
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If the ferritin keeps falling, the answer may not be a better supplement. It may be a better diagnosis.
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And step six, reassess the patient, not just the ferritin.
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Treatment is not finished when you send the prescription or supplement recommendation.
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Reassessment tells us whether our hypothesis was useful. Did the hemoglobin change if anemia was present?
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Did the ferritin and transferrin saturation move in the expected direction? Did the patient's fatigue improve?
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Are the restless legs better? Is exercise tolerance returning? Is the bleeding still happening?
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And if the laboratory markers do not respond, do not simply increase the dose forever or add another supplement.
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Ask yourself, why? Is the patient taking it? Are they tolerating it? Is there ongoing loss? Is there malabsorption?
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Is inflammation complicating the picture? Was iron actually the explanation for the symptom we are trying to treat?
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The last question is the one that matters the most. Sometimes you correct iron deficiency and the fatigue remains.
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That does not mean treating the iron was a mistake. It means iron deficiency was real, but it was not the entire story.
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It was not causing the patient's symptom that brought them in.
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Patients can have more than one thing happening at the same time. And that is the whole point of systems-based thinking.
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The case I want you to remember, let's put it together.
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A 51-year-old patient comes in with fatigue, reduced exercise tolerance, headaches, and difficulty concentrating.
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Hemoglobin is 13.1, MCV is normal. They were told their CBC looks good.
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Instead of saying your labs are normal, you ask what has changed. They recently started training for a half marathon.
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They donate blood several times a year.
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Their diet has become more restrictive because they are trying to improve their metabolic health.
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They do not report obvious gastrointestinal bleeding. Now you have a hypothesis.
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You order iron studies because the test answers the clinical question.
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The ferritin is low and the transferrin saturation supports iron depletion. You do not stop there.
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You discuss blood donation frequency, training demand, dietary intake, and whether there are any additional clues suggesting blood loss or malabsorption.
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You replace iron using tolerable evidence-informed regimen. You reassess the laboratory response and the symptoms.
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That is integrative medicine, not because you ordered a special test, because you connected the patient's behavior, physiology, risk factors, laboratory data, and treatment response into one clinical story. Before we close, I want to leave you with a few pearls.
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Pearl number one, a normal hemoglobin can tell you that your patient is not anemic by that measure.
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It cannot by itself tell you that iron stores are adequate. Pearl two, ferritin is useful, but context matters.
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Inflammation can make ferritin look more reassuring than the patient's iron availability actually is.
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Pearl three, do not turn disease-specific thresholds or internet optimal ranges into universal treatment targets.
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Pearl number four, iron deficiency is a diagnosis that deserves an explanation.
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Menstrual loss, gastrointestinal loss, blood donation, inadequate intake, malabsorption, and increased demand are not interchangeable.
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Pearl number five, correcting a deficiency and identifying its cause are two separate jobs, but you need to do both.
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And pearl six, more iron is not always better. Iron is essential, but excess iron is not benign.
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Treat documented deficiency thoughtfully and reassess. Here's your challenge this week.
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The next time you see a patient with fatigue, reduced exercise tolerance, restless legs, or unexplained hair shedding, do not automatically order ferritin and do not automatically dismiss iron because the CBC is normal.
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Ask one question first. What in this patient's story makes iron deficiency plausible?
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Then if you test, make sure you know what each marker is actually telling you.
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That is the shift from ordering labs to practicing clinical reasoning.
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If this episode changed the way you think about iron, I'd love for you to share it with another nurse practitioner who has ever looked at a normal CBC and wondered whether they were missing something.
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And if this kind of clinical reasoning is what you want more of, this is exactly what we do inside a BridgeWell Integrative Education.
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The BridgeWell Transformation Pathway is designed for nurse practitioners who want to move beyond memorizing protocols and learn how to connect physiology across systems, interpret testing with purpose, and build more confidence applying functional and integrative medicine in real clinical practice.
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replacing iron without asking why it became low is not root cause medicine.
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And normal hemoglobin does not always mean the iron story is finished. I'm Dr. Sheri Erwin.
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Thank you for spending part of your day with me. I'll see you next time on the The Integrative Clinician by Bridgewell.