Tests for vitamin deficiency

Vitamin deficiency

Test name

Vitamin B1
(Thiamine)

RBC transketolase activity

Vitamin B2
(Riboflavin)

Glutathion reductase activity

Vitamin B6
(Pyridoxine)

• RBC transaminase activity

• Tryptophan load test (measure
xanthuric acid)

Vitamin B9

(Folic acid)

Histidine load test (measure
FIGLU excretion)

Vitamin B12

(Cobalamin)

• Methylmalonic acid (MMA) test

• Schilling test (Measures the
absorption of radiolabeled B12)