What are the most accurate tests for diagnosing low vitamin A?

What are the most accurate tests for diagnosing low vitamin A?

What are the most accurate tests for diagnosing low vitamin A? Key messages • The two most common tests (serum or plasma retinol and retinol-binding protein) cannot reliably identify at-risk individuals with or without vitamin A deficiency in the community or clinics. • This may mean that using these tests could lead to over- or underestimated levels of low vitamin A at the population level and incorrect diagnosis of individuals. • Estimates of …