What It Measures#
Iron studies are a panel of blood tests that evaluate how much iron your body has, how well it is being transported, and how much is stored. The panel includes:
- Serum Iron — the amount of circulating iron in your blood at the time of testing.
- Ferritin — the primary iron-storage protein; the best indicator of total body iron stores. Low ferritin is the earliest sign of iron deficiency.
- TIBC (Total Iron Binding Capacity) — measures the blood's capacity to bind and transport iron via transferrin. High TIBC indicates iron deficiency.
- Transferrin Saturation (TSAT%) — the percentage of transferrin that is saturated with iron. Calculated as (Serum Iron / TIBC) × 100.
Iron is essential for haemoglobin production, oxygen transport, energy metabolism, and immune function. Iron deficiency is the most common nutritional deficiency in India, affecting an estimated 50% of women of reproductive age.
Who Should Get Tested#
- Women with heavy menstrual bleeding, pregnancy, or post-partum fatigue.
- Anyone with low haemoglobin or anaemia detected on CBC.
- Children with poor growth, recurrent infections, or pica (craving non-food items).
- Vegetarians and vegans — plant-based iron (non-haeme) is less well-absorbed.
- People with chronic fatigue, dizziness, breathlessness, or brittle nails.
- Patients with chronic kidney disease, inflammatory bowel disease, or celiac disease.
- To differentiate iron-deficiency anaemia from anaemia of chronic disease or thalassaemia trait.
How to Prepare#
- Fasting for 8–12 hours is recommended for the most accurate serum iron and TIBC readings (iron levels fluctuate with meals).
- Test in the morning — serum iron levels are highest in the morning and drop by evening.
- Stop iron supplements 24–48 hours before the test (consult your doctor first).
- Inform your doctor about recent blood transfusions or iron infusions.
Understanding Your Results#
| Parameter | Normal Range | Low | High | |-----------|-------------|-----|------| | Serum Iron | 60–170 µg/dL | Iron deficiency, chronic disease | Iron overload, haemochromatosis | | Ferritin | M: 30–400 ng/mL; F: 13–150 ng/mL | Iron-deficiency anaemia (earliest marker) | Inflammation, liver disease, iron overload | | TIBC | 250–370 µg/dL | Chronic disease, malnutrition | Iron deficiency | | TSAT% | 20–50% | < 20% = iron deficiency | > 50% = possible iron overload |
Important: Ferritin is also an acute-phase reactant — it rises during inflammation, infection, and liver disease. A "normal" ferritin in the presence of inflammation may still mask underlying iron deficiency. Your doctor may check CRP alongside ferritin to interpret correctly.
Related Tests#
- CBC — confirms anaemia and red-cell indices (MCV, MCH).
- Haemoglobin Test — quick assessment of oxygen-carrying capacity.
- Vitamin B12 Test — rules out megaloblastic anaemia as a co-factor.
- CRP Test — helps interpret ferritin in the context of inflammation.
Booking & Home Collection#
Book iron studies on PingMeDoc with fasting-friendly morning home collection. Complete panel results within 24 hours.