Vitamin deficiency

Biochemistry

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Vitamin deficiency	Test name
Vitamin B1 (Thiamine)	RBC transketolase
Vitamin B2 (Riboflavin)	Glutathion reductase
Vitamin B6	RBC transaminase
Vitamin B6 (Pyridoxine)	Tryptophan load test (measure xanthuric acid)
Vitamin B9	Histidine load test (measure FIGLU excretion)
Vitamin B12	Methylmalonic acid (MMA)
Vitamin B12	Schilling test (Measures the absorption of radiolabeled B12)