-IBIS-1.5.0-
rx
Misc. Lab Diagnostics
vitamin B6 (pyridoxine)
diagnoses

definition

lab: vitamin B6 (pyridoxine) deficiency:
tryptophan load test

• This test involves giving a 2 gm dose of tryptophan and then measuring the amount of xanthurenic acid in the urine. Since the step of converting 3-Hydroxykynurenine into xanthurenic acid is a very easy one and doesn't require much vitamin B-6, a deficiency will produce an excess amount of xanthurenic acid.

(Marz)


footnotes