Vitamin B6

Referred to Berkshire & Surrey Pathology Services, Frimley Park Hospital NHS Foundation Trust, Portsmouth Road, Frimley, Surrey GU16 7UJ

Alternative names, keywords

Pyridoxal phosphate, PLP

Samples required

EDTA blood (purple cap/ yellow cap ring, 4 mL tube). Smaller tubes are available for paediatric samples.

Sample should ideally be protected from light - wrap in foil - and must reach laboratory within 6 hours of collection. B1, B2 and B6 can share same sample if necessary.

Avoid measurement of B2 and B6 during a severe acute phase response (e.g. surgery), allowing at least 14 days afterwards.

Test indications

Symptoms of B6 deficiency, or suspected deficiency due to poor intake or malabsorption.

Reference range

35 - 110 nmol/L

Turnaround time

Referral lab quotes turnaround time of 12 days, however additional time must be allowed for packing, dispatch and delivery of sample, and return and processing of results.


Biochemistry (Referrals)