Vitamin A tolerance test

The liver is the place where vitamin A is stored (accounting for about 90% of the body's vitamin A, so the level of vitamin A in the serum does not fully represent the state of the overall vitamin A, that is, when the serum vitamin A level is at a normal low value, there is also a liver depletion. Possible. Therefore, in suspicious circumstances, a sensitive and reliable relative dose-response test should be used to further determine the subclinical status and vitamin A deficiency. During the test, oral vitamin A5000U (oil) / kg body weight is taken, and blood is collected for inspection after 3 or 6 hours of fasting .