Plasma/Pattern Serum Vitamin B6 (Pyridoxal/Pyridoxine) Profile

What Vitamin B6 Is and Its Role in Your Body

Vitamin B6, also called pyridoxine, is a water-soluble B vitamin that plays a key role in breaking down proteins, synthesizing neurotransmitters like serotonin and dopamine, and supporting immune function. Your body doesn’t store it long-term, so maintaining adequate intake is important. This test helps determine if your levels are sufficient or if there’s a need for monitoring.

How the Test Works: Analyte and Method

This test involves analyzing serum (or plasma) for specific forms of vitamin B6 (pyridoxal and pyridoxine) using a specialized immunoassay or related biochemical method. The pattern may also reflect how these forms are metabolized or stored in your bloodstream, which can provide additional insights beyond just individual levels.

Why You Might Need This Test

A vitamin B6 profile may be ordered if you have symptoms like fatigue, nerve pain, depression, or anemia, or if you have conditions such as pregnancy, malabsorption disorders (e.g., celiac disease), or certain medications that interfere with vitamin absorption. It can also help diagnose or monitor deficiencies or metabolic imbalances.

What to Expect Before the Test

No special preparation is typically needed, but you may be asked to fast for 8–12 hours before the blood draw if your test includes fasting components. Avoid excessive alcohol or certain supplements (like high-dose vitamin B6) for a few days before testing, as they could affect results.