Iron deficiency is the #1 nutritional deficiency worldwide. In India, approximately 50% of women and 25% of men are iron deficient. Yet most people experiencing fatigue, breathlessness on stairs, hair loss, and poor concentration never get tested for it. They're told their hemoglobin is "normal" and sent home — missing the fact that hemoglobin is the last marker to fall. Iron stores deplete long before hemoglobin drops. You can have textbook "normal" hemoglobin and functionally depleted iron causing crushing fatigue.
The World Health Organization estimates 1.6 billion people worldwide have iron deficiency anemia — more than 20% of the global population. But that's only counting those with low hemoglobin. If you include everyone with depleted iron stores who still has "normal" hemoglobin? The number doubles or triples.
India bears a disproportionate share. In Indian women aged 15-49, iron deficiency prevalence reaches 50% in many regions. In men, it's 25-30%. Why? Three converging factors unique to India:
The result: Indian women experience iron deficiency at rates twice that of men, and much higher than women in Western countries. This isn't just a nutritional fact — it's a major driver of fatigue, reduced work capacity, and impaired child development (maternal iron deficiency increases child anemia risk).
Iron deficiency is India's most common nutritional deficiency — 50%+ of women and 23% of men. Ferritin below 30 ng/mL causes fatigue, hair loss, brain fog, and poor immunity even when hemoglobin is "normal." Test ferritin, not just CBC.
| Status | Ferritin (ng/mL) | Typical Symptoms | Recommended Intervention |
|---|---|---|---|
| Depleted | <15 | Severe fatigue, dyspnea, syncope risk | IV iron or high-dose oral iron; urgent repletion |
| Low | 15–30 | Moderate fatigue, hair loss, cold sensitivity | Oral iron supplementation + dietary optimization |
| Suboptimal | 30–50 | Mild fatigue, impaired focus, exercise intolerance | Dietary iron sources + reassess quarterly |
| Optimal | 50–100 | No symptoms; normal energy, cognition, immunity | Maintain; annual monitoring |
| High | >200 | Joint pain, fatigue paradoxically, organ damage risk | Screen for hemochromatosis; phlebotomy if indicated |
| Form | Typical Dose | Timing | Co-Factors for Absorption |
|---|---|---|---|
| Ferrous sulfate | 325mg daily (65mg elemental iron) | Empty stomach, 1h before food | Vitamin C 100mg; avoid tea/coffee/calcium |
| Ferrous glycinate | 25-50mg daily (better tolerated) | With or without food | Vitamin C; amino acid chelation aids absorption |
| Ferric maltose | 100-200mg daily (better GI tolerance) | With food if GI upset occurs | Vitamin C boosts absorption |
| IV Iron (Infed, Venoferon) | 100-200mg per infusion, 1-4x weekly | Single IV dose; rapid repletion (weeks vs. months) | 100% bioavailability; bypasses GI absorption entirely |
This is the biggest gap in clinical practice. When you say you're exhausted, most physicians order a hemoglobin test (or basic CBC). If hemoglobin is above 12 g/dL (the "normal" cutoff), you're told "your blood is fine" and sent away. The problem: hemoglobin is the last marker to fall.
Iron depletion happens in stages:
The trap: A patient with ferritin of 20 ng/mL (depleted) and hemoglobin of 13 g/dL (technically "normal") gets told "your CBC is normal" — missing the functional iron deficiency causing their symptoms. This happens constantly in India.
This is why ferritin matters more than hemoglobin. Ferritin tells you your iron stores. Hemoglobin tells you what you already have in your blood right now — but it's a late marker.
Most laboratory reference ranges for ferritin start at 12-15 ng/mL as "normal." This is inappropriate. A ferritin of 12 ng/mL is iron-depleted and symptomatic. The lab range reflects the 2.5th to 97.5th percentile of the tested population — it's a statistical range, not a functional range.
Optimal ferritin for most adults: 50-150 ng/mL. At this level, you have adequate iron stores, energy, and no deficiency symptoms. Below 50 ng/mL, symptoms emerge even if hemoglobin is normal.
For athletes and heavy exercisers: 80-150 ng/mL is optimal. Endurance athletes lose iron through foot-strike hemolysis (impact breaks red blood cells), sweat losses, and exercise-induced hepcidin elevation. A distance runner with ferritin of 40 ng/mL will experience unexplained fatigue, poor race performance, and slow recovery — even though "normal" lab range says 12+ is fine. Optimal for athletes is 80+.
Here's the practical point: if your ferritin is below 30 ng/mL, you have functionally depleted iron and will experience symptoms — fatigue, breathlessness, hair loss, poor concentration. If it's 30-50, you're at-risk and symptoms are likely emerging. If it's 50+, you have adequate stores for normal function. If it's 80+, you have robust stores for exercise and stress.
Iron deficiency symptoms extend far beyond "tiredness." Iron is essential for oxygen transport (hemoglobin), energy production (cytochrome oxidase), and cellular function. When iron depletes, every aerobic process suffers.
The key: these symptoms improve completely with iron repletion. If you have these symptoms and your ferritin is below 50, iron supplementation will likely change your life. Many patients describe it as feeling like themselves again.
The epidemiology is stark: 50% of Indian women vs. 25% of men. This isn't genetic. It's the perfect storm of three factors converging in women's bodies:
The average menstrual period loses 10-30 mg of iron. Some women lose more: heavy periods (menorrhagia) lose 20-40+ mg per cycle. In a 28-day cycle, that's a continuous drain. If you're on a plant-based diet with poor iron absorption, you lose more than you can replace, and ferritin declines month by month. Iron repletion alone is insufficient — the underlying cause (heavy periods) must be addressed. This might mean hormonal contraception (which thins the endometrium and reduces bleeding) or treating underlying bleeding disorders.
Plant-based iron (non-heme iron) has 2-5% bioavailability compared to 20-30% for animal-based iron (heme iron). This means a vegetarian eating 20 mg of plant iron may absorb only 1-4 mg; a non-vegetarian eating 20 mg of mixed iron may absorb 4-6 mg. Over months, this difference is massive.
Worse, plant-based diets often contain iron inhibitors: phytates (in grains), tannins (in tea and coffee), calcium (in dairy). A vegetarian drinking tea with meals further reduces iron absorption. To absorb plant iron, you need vitamin C (citric acid) and absence of inhibitors — meaning iron-rich meals shouldn't be paired with tea, coffee, or high-calcium foods.
Practical point for vegetarians: Pair iron-rich meals with vitamin C (lemon, lime, amla, orange) and avoid tea/coffee for 2 hours before and after meals. Even this optimization can't match the absorption of meat-based iron.
Each pregnancy depletes 500-1000 mg of iron for fetal development and increased maternal blood volume. In India, where spacing between pregnancies may be short and iron supplementation during pregnancy is not universal, iron stores never fully recover. By the third pregnancy, many women are profoundly iron-depleted.
Result: a 35-year-old woman with three pregnancies, monthly menstrual losses, and a vegetarian diet is essentially guaranteed to be iron-deficient.
Many people assume iron deficiency is simply dietary. It's not. Several medical conditions cause iron deficiency regardless of diet:
Even if you eat adequate iron, if you can't absorb it, you'll become deficient. Celiac disease damages the intestinal lining and impairs iron absorption. H. pylori infection reduces stomach acid (which is essential for iron solubilization and absorption). Post-gastric-bypass surgery impairs iron absorption dramatically. Chronic PPIs (proton pump inhibitors) reduce stomach acid and block iron uptake. If someone is iron-deficient despite adequate diet and no heavy bleeding, malabsorption should be investigated.
While menstruation is normal, heavy bleeding is not. If you're soaking through a pad every 1-2 hours, passing clots, or bleeding for >7 days, you have menorrhagia. This can lose 20-40+ mg of iron per cycle — far exceeding dietary replacement. Menorrhagia requires investigation: thyroid dysfunction, bleeding disorders (von Willebrand, platelet disorders), or uterine fibroids are common culprits. Treatment might be hormonal (birth control to thin endometrium), surgical (ablation or hysterectomy), or pharmacological (tranexamic acid to reduce bleeding).
Slow, invisible GI bleeding is easy to miss. A peptic ulcer losing 10 mL of blood daily goes unnoticed until hemoglobin drops — but iron stores are depleting the whole time. Inflammatory bowel disease (Crohn's, ulcerative colitis), colorectal polyps or cancer, and NSAIDs (which erode the gastric mucosa) are common causes. If someone is iron-deficient, especially men (who shouldn't be losing blood), GI bleeding must be ruled out. This might require endoscopy.
PPIs reduce stomach acid and impair iron absorption. NSAIDs (aspirin, ibuprofen) cause chronic GI bleeding. Certain antibiotics interfere with absorption. If you're iron-deficient and on any of these, the medication may be the culprit.
Most people get a single hemoglobin or CBC test. This is insufficient. To fully understand iron status, you need:
Your iron stores. Low = depleted stores (even if hemoglobin is normal). Normal cutoff on many labs is 12-15 ng/mL; functional adequacy is 50+.
Iron circulating in blood right now. Can fluctuate daily based on diet and absorption. Must be interpreted with TIBC and transferrin saturation.
Measures transferrin (the protein that carries iron). High TIBC with low iron indicates iron deficiency. TIBC is a marker of iron-binding capacity; in deficiency, it rises as the body tries harder to hold onto available iron.
Serum iron divided by TIBC, expressed as a percentage. Normal is 20-50%. Low (<20%) indicates iron deficiency. High (>45%) indicates iron overload.
Hemoglobin, hematocrit, red blood cell count, and indices (MCV, MCH, MCHC). Iron-deficiency anemia shows low hemoglobin, low MCV (microcytic — small red blood cells), and low MCH (low iron per cell).
Young red blood cells. After iron repletion starts, reticulocyte count should rise within 1-2 weeks as the bone marrow ramps up RBC production. This confirms that iron is being absorbed and utilized.
This is critical. Ferritin is an acute-phase reactant — it rises with any inflammation (infection, fever, autoimmune disease, inflammatory bowel disease). A patient fighting pneumonia or with elevated CRP will have artificially elevated ferritin even if iron stores are depleted. Without measuring CRP, you'll misinterpret ferritin. arq. always includes CRP: if both ferritin and CRP are elevated, iron status is masked. Once inflammation resolves, retest ferritin to see true stores.
This comprehensive panel reveals: Do you have iron deficiency? Is it mild (depleted stores), moderate (early anemia), or severe (symptomatic anemia)? Is inflammation falsely elevating ferritin? Are you absorbing supplemental iron (reticulocyte count rises)? This level of detail drives treatment decisions.
Ferrous sulfate, ferrous fumarate, or ferrous bisglycinate taken by mouth. Dose: typically 200-325 mg elemental iron daily (or split into 2-3 doses). Standard treatment is 3-6 months to replete ferritin.
Side effects: Constipation (common), nausea, dark stools, abdominal discomfort. These side effects make 20-30% of people stop treatment. To minimize: take with food (reduces absorption slightly but improves tolerability), space doses 8-12 hours apart, start low and titrate up.
Absorption tips: Take on an empty stomach with orange juice (vitamin C enhances absorption) if tolerated. Avoid taking with tea, coffee, milk, or calcium supplements (these inhibit absorption). Wait 2 hours after iron before consuming tea or coffee. Taking iron at night often reduces nausea.
Iron bound to the amino acid glycine. Better absorption and far fewer GI side effects than ferrous sulfate. Cost is higher but tolerability is superior. Many people who can't tolerate standard iron do fine on bisglycinate. For people with sensitive GI tracts or history of GI problems, this is a better choice.
Reserved for:
IV iron (ferric carboxymaltose, iron sucrose) bypasses GI absorption entirely. Full repletion takes 4-8 weeks vs. 3-6 months for oral. Cost: 2000-8000 INR per infusion in India (vs. 200-400 INR/month for oral). Faster, more expensive, and reserved for specific indications.
Hemoglobin response (symptom improvement): 2-4 weeks. Within 2-4 weeks on adequate iron, hemoglobin begins rising. Symptoms improve dramatically: fatigue lifts, breathlessness decreases, hair shedding slows, restless legs improve. This early response is very encouraging and motivates people to continue.
Ferritin repletion (iron stores): 3-6 months minimum. Hemoglobin normalizes faster than ferritin. Many people stop iron supplementation once they "feel better" (hemoglobin normalized, symptoms resolved) at 4-6 weeks — but ferritin is still low. Then 2-3 months later, symptoms return as ferritin depletes further. This cycle can repeat.
Full repletion requires 4-6 months of continuous supplementation. Once ferritin reaches 50-100 ng/mL, ongoing maintenance supplementation may be needed depending on the cause. If the underlying cause is ongoing (heavy periods, ongoing vegetarian diet with poor absorption), permanent or long-term maintenance supplementation (200-300 mg elemental iron 2-3 days per week) is often necessary.
Experiencing fatigue, breathlessness, or hair loss? The cause may be in your blood. Check if iron deficiency is your problem →
Most clinicians treat iron deficiency symptomatically: fatigue → hemoglobin test → "normal" → dismiss, or low hemoglobin → prescribe iron → recheck in 3 months. arq. takes a different approach.
arq.'s difference:
No AI chat. No templates. A specialist reads your panel against South Asian-calibrated ranges and writes the protocol on a 15–20 minute video consult — inside 7 days of your home draw.