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Vitamin B6

Category Biochemistry
Test background

Vitamin B6 is a water-soluble vitamin which comprises pyridoxine, pyridoxal and their 5-phosphate esters. Pyridoxal 5-phosphate (PLP) is the active co-enzyme form of vitamin B6 required for many reactions of amino acid metabolism. Deficiency may occur in the diet, or due to drugs, eg. isoniazid or penicillamine. Symptoms of deficiency include skin hyperpigmentation, tongue swelling, depression and irritability.

Clinical Indications

Suspected deficiency in malabsorption syndromes and in patients on parenteral nutrition.

Reference range

See report

Sample & container required EDTA (lavender top)
Sample volume 1 mL
Turnaround time Up to 6 weeks

Not currently performed in house; this is a referred test.