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Plasma Vitamin B6 (Pyridoxine) Concentration

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of Vitamin B6 (pyridoxine) in your plasma, an essential nutrient involved in metabolism and nerve function.

Quick summary

["Vitamin B6 helps your body process proteins and maintain nerve health."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
79324-0
Short code
PLP + PL + Vit B6 Pnl CSF
Synonyms
PLP + PL + Vit B6 Pnl CSF
Category
electrolyte
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like numbness, weakness, or unusual fatigue, or if you’re at risk for deficiencies due to certain medications, dietary habits, or health conditions. It may also be checked during pregnancy or if you have conditions like anemia or neurological disorders.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for a few hours before the blood draw, but this depends on your provider’s instructions. Bring any medications you’re taking to discuss with them beforehand.

What the Results Mean

Results help determine if your Vitamin B6 levels are within normal ranges. Low levels might indicate poor absorption, certain medical conditions, or excessive use of medications that deplete Vitamin B6. High levels could suggest over-supplementation or specific metabolic disorders.

Common Reasons for Low Vitamin B6 Levels

Conditions like pregnancy, kidney disease, or certain medications (e.g., anticonvulsants) can lower Vitamin B6. Poor diet, malabsorption issues, or chronic alcohol use may also contribute.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Vitamin B6 Level

Frequently asked questions

What causes Vitamin B6 deficiency?
Deficiency can result from poor diet, certain medications (like some antiepileptics), kidney disease, or malabsorption disorders. Lifestyle factors, such as heavy alcohol use or excessive vitamin B6 supplements, may also play a role.
How long does it take to correct Vitamin B6 deficiency?
Treatment typically involves dietary changes (e.g., foods like chickpeas, potatoes) or supplements under medical supervision. Results may improve within weeks, but severe cases may require longer adjustments.
Can Vitamin B6 levels be affected by medications?
Yes, certain medications (e.g., isoniazid, anticonvulsants) can deplete Vitamin B6. Always discuss all medications with your provider, as they may need to adjust your Vitamin B6 intake or monitoring.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy