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