# FIGLU excretion test is used to estimate deficiency of:
A. Vitamin K
B. Vitamin B12
C. Vitamin Folic acid
D. Niacin
The correct answer is C. Vitamin Folic acid.
Folic acid is associated with the metabolism of histidine. Formiminoglutamate (FIGLU) formed in histidine metabolism accumulates and is excreted in urine. Histidine load test utilizing the excretion of FIGLU in urine is used to assess folic acid deficiency.
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