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24-Hour Vitamin B6 Intake Measurement (Substance Content)

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

This test measures the amount of vitamin B6 (pyridoxine) you consumed over a 24-hour period, not your body’s current levels.

Quick summary

["Understanding your vitamin B6 intake helps assess dietary adequacy and potential deficiencies."]

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

Key facts at a glance

LOINC
81065-5
Short code
Vit B6 intake 24h Measured
Synonyms
Vit B6 intake 24h Measured
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
measured
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

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like fatigue, nerve problems, or unusual cravings for foods containing vitamin B6. It may also be used to monitor vitamin B6 intake in people with certain medical conditions or those taking medications that affect vitamin absorption.

What to Expect Before the Test

No special preparation is needed. You’ll simply record all vitamin B6-containing foods and supplements you consumed in the past 24 hours. Your provider may ask you to keep a food diary or use an app to track intake.

How the Test Works

This is not a blood or urine test. Instead, it relies on self-reporting of dietary intake. Your healthcare provider may use a specialized questionnaire or dietary assessment tool to calculate your total vitamin B6 consumption.

What the Results Mean

Results are compared to general dietary guidelines for vitamin B6 intake. Low intake may indicate dietary habits that need adjustment, while high intake might warrant further evaluation if symptoms like nausea or neurological issues are present.

Reference range

Premenopausal: 20-400 pg/mL; Postmenopausal: <30 pg/mLN/A

Specimen: serum

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.

◆Associated findings1

Short name

Vitamin B6 Intake (24h)

Frequently asked questions

How is vitamin B6 measured in a 24-hour period?
Vitamin B6 intake is measured through self-reported dietary records or questionnaires that track all foods and supplements containing vitamin B6 (e.g., fortified cereals, meat, poultry, fish, nuts, seeds, or supplements). Your provider may use standardized intake databases to calculate total intake.
What foods contain vitamin B6?
Common vitamin B6-rich foods include whole grains (e.g., fortified cereals), meat (e.g., chicken, turkey, pork), fish (e.g., salmon, tuna), nuts (e.g., peanuts, sunflower seeds), and legumes (e.g., lentils, chickpeas). Vegetables like potatoes and bananas also contain small amounts.
Can vitamin B6 intake be affected by medications?
Yes, certain medications (e.g., some antibiotics, birth control pills, or anticonvulsants) can interfere with vitamin B6 absorption or metabolism. If you’re on medication, discuss potential interactions with your provider to ensure accurate intake assessment.
  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