Vitamin B6 (Pyridoxal 5'-Phosphate) Intake Assessment, 24-Hour Estimate
This assessment estimates how much vitamin B6 (pyridoxine) you took in over a 24-hour period, usually from a food or supplement diary rather than a direct blood measurement. It helps gauge whether your usual intake falls in a healthy range.
["This is an intake estimate based on a 24-hour dietary or supplement review, not a direct measurement of vitamin B6 in your body."]
Key facts at a glance
- LOINC
- 81064-8
- Short code
- Vit B6 intake 24h Est
- Synonyms
- Vit B6 intake 24h Est
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 20
- Ref high
- 400
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- estimated
- CPT
- 82670
- 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
What This Test Represents
This entry reflects an estimate of vitamin B6 intake over 24 hours, typically derived from a diet recall, food diary, or supplement review. It is different from a blood test that measures the amount of vitamin B6 actually circulating in your body.
Why Vitamin B6 Matters
Vitamin B6 helps your body process proteins, make red blood cells, and support normal nerve and immune function. Getting too little over time can contribute to tiredness, skin changes, or nerve symptoms, while very high supplemental doses taken long term can also cause nerve problems.
How the Estimate Is Gathered
A clinician or dietitian reviews what you ate and drank and any supplements used during the previous day, then estimates the vitamin B6 content using food composition data. Accurate recall and a complete supplement list make the estimate more reliable.
Limitations to Keep in Mind
A single 24-hour intake estimate captures only one day and may not reflect your usual habits. It also cannot confirm whether your body has enough vitamin B6, so it is usually interpreted alongside symptoms, overall diet, and other laboratory tests when needed.
Reference range
Premenopausal: 20-400 pg/mL; Postmenopausal: <30 pg/mLN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Vitamin B6 intake assessment is used to screen for possible inadequate or excessive intake and to guide dietary counseling. Because it estimates intake rather than measuring nutrient status, it does not by itself diagnose deficiency or toxicity; those determinations require clinical context and, when appropriate, direct laboratory testing.
Short name
Vitamin B6 Intake
Frequently asked questions
Does this test measure the vitamin B6 level in my blood?
How should I prepare for this assessment?
Can one day's intake tell me if I have a deficiency?
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