<prompt> FIGLU excretion test is used for assessment of deficiency of ?Vitamin B12NiacinFolic acidPyridoxin  <response>: Ans. is c i.e., Folic acidAssessment of folate deficiencyFollowing tests arc used for assessment of folate deficiency.i Blood level :- Normal level in serum is about 2-20 nanogramml and about 200 micorgramml of packed cells.ii Histidine load test or FIGLU excretion test :- Histidine is normally metabolized to formimino glutamic acid FIGLU from which formimino group is removed by THF. Therefore in folate deficiency, FIGLU excretion is increased in urine. 