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Micronutrients - Clinical indicators

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There are several indicators for micronutrient deficiencies. Some indicators are clinical, that is, people with a certain deficiency may show signs or symptoms. Examining a group of individuals in a population for signs or asking them about symptoms which are characterstic of a specific micronutrient deficiency is one way of measuring how common that deficiency is in the population. The table below lists some clinical indicators for the three major micronutrients (click on the term to see photos):

Clinical indicator Micronutrient deficiency
Pallor of palms or inside of eyelids or mouth Iron deficiency anaemia
Night blindness (inability to see in low light) Vitamin A deficiency
Bitot's spots (spots on whites of eyes) Vitamin A deficiency
Goitre (enlargement of thyroid gland) Iodine deficiency