Ferritin determines how much iron your body has in reserve. While haemoglobin shows how much iron is currently in your red blood cells, ferritin tells you how much is stored for later use.
How iron storage works
Your body stores iron as ferritin in your liver, spleen and bone marrow. When needed, ferritin releases iron. Ferritin drops before haemoglobin does, making it the earliest marker of iron deficiency.
The three stages of iron deficiency
Stage 1: Ferritin drops (stores depleted), haemoglobin still normal. Stage 2: Serum iron drops. Stage 3: Haemoglobin and MCV drop (manifest anaemia). Testing ferritin catches the problem at stage 1.
Risk groups
Women with heavy menstruation, pregnant women, vegetarians/vegans, intensive athletes and people with gut conditions are at higher risk for low ferritin.
Boosting ferritin
Iron-rich foods (red meat, legumes, dark leafy greens), vitamin C alongside plant-based iron, and avoiding tea/coffee/dairy with iron-rich meals. Consider supplements only with confirmed deficiency.
Frequently asked questions
What is the difference between ferritin and serum iron?
Serum iron measures currently circulating iron (fluctuates daily). Ferritin measures iron stores (more stable and reliable).
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