24-Hour Vitamin B7 (Biotin) Intake Assessment
This test measures the amount of biotin (vitamin B7) you consumed over a 24-hour period, typically via dietary intake logs or specialized tracking methods.
["Understanding your biotin intake helps assess dietary habits and potential deficiencies."]
Key facts at a glance
- LOINC
- 81017-6
- Short code
- Vit B7 intake 24h Est
- Synonyms
- Vit B7 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
Why This Test Is Done
Your healthcare provider may recommend this test if you have symptoms like hair loss, skin rashes, or neurological issues that could be linked to biotin deficiency. It may also be used in research or clinical studies to study dietary vitamin intake patterns.
How the Test Works
Instead of collecting a blood or urine sample, this test relies on tracking your dietary intake of biotin over 24 hours. You’ll document foods containing biotin (such as eggs, meat, dairy, and fortified foods) and report the amounts consumed.
Sample Collection Process
No blood or bodily fluid sample is drawn for this test. You’ll receive instructions to record your dietary intake for a full day, often using a provided log or digital tool. Some studies may use biomarkers or metabolic analysis to estimate intake indirectly.
What to Expect Before the Test
No special preparation is needed. Simply follow your normal diet and keep a detailed record of all foods containing biotin. Avoid supplements unless instructed otherwise, as they may skew results.
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.
Biotin plays a critical role in metabolism, fatty acid synthesis, and maintaining healthy skin, hair, and nails. While rare, severe deficiencies can cause neurological symptoms or metabolic disorders. This test helps identify excessive or insufficient intake, guiding dietary adjustments if needed.
Short name
24-Hour Biotin Intake
Frequently asked questions
How long does it take to get results?
Can I eat normally while tracking my biotin intake?
What if I take biotin supplements?
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