Imperial Collage Healthcare

Vitamin B6

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 Required
EDTA (lavender top)

Sample Volume
1 mL

Turnaround Time
Up to 6 weeks

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

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