Vitamin B6 (Pyridoxine) Phosphorylated Metabolite, Serum/Plasma Mass Concentration
This test measures the levels of phosphorylated forms of vitamin B6 (pyridoxine) in your blood. Vitamin B6 is an essential nutrient involved in metabolism and nerve function.
["This test helps assess how well your body is using vitamin B6, which is important for overall health and preventing deficiencies."]
Key facts at a glance
- LOINC
- 30552-4
- Short code
- Pyridoxal Phos SerPl-mCnc
- Synonyms
- Pyridoxal Phos SerPl-mCnc
- Category
- electrolyte
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 44
- Ref high
- 147
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84075
- SNOMED
- 27550007
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms of vitamin B6 deficiency, such as nerve problems, anemia, or unusual mood changes. It may also be used to monitor vitamin B6 levels in people with certain medical conditions or those taking medications that can affect vitamin B6 metabolism.
What to Expect Before the Test
No special preparation is usually needed for this blood test. You may be asked to fast for a few hours before the draw, but this depends on your healthcare provider’s instructions. Bring any medications you’re currently taking to your appointment.
What the Test Involves
A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch when the needle goes in, but it usually only takes a few minutes. You can resume normal activities immediately afterward.
What the Results Mean
Results are typically reported as a mass concentration in your blood. Your healthcare provider will interpret the results in relation to your overall health and symptoms. Abnormal levels may indicate vitamin B6 deficiency or other metabolic issues.
Reference range
Adult: 44-147 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Vitamin B6 is crucial for breaking down proteins, forming neurotransmitters like serotonin and dopamine, and supporting red blood cell production. Phosphorylated metabolites of vitamin B6 are part of its active forms in the body. Abnormal levels may signal underlying metabolic disorders, nutrient deficiencies, or side effects from certain medications.
Short name
Vitamin B6 Phosphorylated Metabolite
Frequently asked questions
What causes vitamin B6 levels to be checked?
How long does it take to get results?
Can I eat or drink before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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