Which of the following is a functional test of vitamin A status?
A) relative dose response
B) retinol isotope dilution
C) dark adaptation
D) liver biopsy

Question

Quizplus · Accepted Answer

Dark adaptation is a functional test of vitamin A status because it measures the time required for the eyes to adjust to darkness, which is dependent on the ability of the retina to regenerate visual pigments, a process that requires vitamin A. The other options (A, B, D) are laboratory-based tests that measure retinol levels in blood, urine, or liver tissue, but do not assess functional vitamin A status.

Which of the Following Is a Functional Test of Vitamin