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Pyridoxine

Vitamin B6 Pyridoxal-5-Phosphate (PLP) B6 Level
EDTA plasma (protect from light) nmol/L

About this test

Cofactor in amino acid metabolism, haem synthesis, and neurotransmitter synthesis. Deficiency causes sideroblastic anaemia, peripheral neuropathy, and glossitis.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 20 – 125 PLP (active form); toxicity risk at >500 nmol/L

Clinical Interpretation

Low / Decreased
Deficiency — malnutrition, alcohol, isoniazid therapy (B6 antagonist), CKD.
High / Increased
Toxicity (>500 nmol/L sustained) — sensory peripheral neuropathy from excess supplementation.
Specimen
EDTA plasma (protect from light)
Reporting Unit
nmol/L
Category
💊 Vitamins

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.