Can you be iron deficient even with normal haemoglobin levels?

Iron deficiency can develop even when haemoglobin levels remain normal, as the body can maintain healthy haemoglobin by drawing on iron reserves. While haemoglobin measures the protein in red blood cells responsible for oxygen transport, ferritin reflects the body's iron reserves. This distinction means that iron deficiency may go undetected by routine blood tests showing normal haemoglobin levels.

Ferritin serves as a warehouse for iron storage in tissues like the liver and spleen, as well as within cells called macrophages. When the body needs iron for erythropoiesis, the process producing red blood cells and haemoglobin, it mobilises these reserves. However, interpreting ferritin alone can be misleading, as it is influenced by factors such as age, sex, pregnancy, menstruation, clinical history, and inflammation.

The World Health Organization advises considering inflammation and, where appropriate, additional markers like C-reactive protein when interpreting ferritin levels. Iron deficiency can arise from various causes, including heavy or prolonged menstrual bleeding, pregnancy, frequent blood donations, vegetarian diets, and chronic, unnoticed blood loss from conditions like ulcers or bleeding piles.

Symptoms of iron deficiency and iron-deficiency anaemia are often vague and may overlap with other conditions, making it crucial to conduct a complete blood count and assess ferritin levels alongside other iron parameters. Treating iron deficiency requires addressing its underlying cause, and unnecessary supplementation can lead to adverse effects.

Consulting medical advice is essential to determine the presence of iron deficiency, identify its cause, and establish an appropriate treatment plan.