Vitamin B6 Profile Pyridoxal-5′-Phosphate, Pyridoxal, Pyridoxine, Pyridoxic Acid)

Beschrijving

Overview

Vitamin B6 refers to a group of chemically related compounds (vitamers) that play essential roles in metabolism, neurotransmitter synthesis, amino acid reactions, and immune function. The most biologically active and clinically informative form is pyridoxal-5′-phosphate (P5P). The other major vitamers include pyridoxal, pyridoxine, and pyridoxic acid (the primary catabolic product).

What This Test Measures

This profile quantitatively assesses multiple vitamin B6 vitamers in serum or whole blood to provide a comprehensive picture of your vitamin B6 status:

• Pyridoxal-5′-phosphate (P5P) — the metabolically active coenzyme form, critical for over 100 enzyme reactions including amino acid metabolism and neurotransmitter production.
• Pyridoxal — a precursor to P5P and an indicator of overall B6 pool.
• Pyridoxine — the form most commonly found in dietary sources and supplements; converted in the body to P5P.
• Pyridoxic Acid — the principal excretion product of vitamin B6 metabolism, useful to assess turnover and catabolism.

Measuring this panel gives greater clinical insight than a single total B6 value, because it distinguishes between active coenzyme levels, precursor availability, and metabolic clearance.

Clinical Use

This comprehensive profile is useful for:

• Evaluating vitamin B6 status and identifying deficiency or excess.
• Monitoring supplementation response and metabolic utilization.
• Investigating symptoms that may be influenced by B6 status, such as neurological complaints, mood disorders, or elevated homocysteine.
• Assessing folate/B6 interactions in one-carbon metabolism and homocysteine regulation.

High levels of vitamin B6 vitamers, particularly pyridoxal-5′-phosphate, should be interpreted in context as very high intake over time can be associated with neurotoxicity.

Method

Quantification is performed using liquid chromatography–tandem mass spectrometry (LC–MS/MS), a highly specific and sensitive analytical technique suited to separate and accurately measure each vitamer.

Sample Requirement

• Serum

Suitable for postal submission.