24-Hour Vitamin D Intake Assessment (Qualitative or Quantitative Measurement)
This test evaluates how much vitamin D you’ve consumed over the past 24 hours, often measured through a dietary or self-reported intake method.
["Understanding your vitamin D intake helps assess dietary habits and potential deficiencies."]
Key facts at a glance
- LOINC
- 81930-0
- Short code
- Vit D intake 24h Measured
- Synonyms
- Vit D 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
What This Test Measures
This test focuses on the total vitamin D consumed from food, supplements, or sunlight exposure within a 24-hour period. It does not measure vitamin D levels in your body but rather tracks dietary intake.
How It’s Done
You’ll likely be asked to keep a food/dietary diary or provide information about supplements and sunlight exposure for the past day. Some labs may use a questionnaire or electronic form to collect this data.
Why It Matters
Knowing your vitamin D intake helps identify if you’re meeting recommended dietary allowances. It’s especially useful for those with dietary restrictions, medical conditions affecting absorption, or those taking supplements.
Common Uses
This test is often used in clinical settings to assess dietary habits, especially in patients suspected of vitamin D deficiency or those managing chronic conditions like osteoporosis or autoimmune diseases.
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.
While this test provides insight into dietary intake, it’s not a direct measure of vitamin D status in your body. For assessing vitamin D levels, a blood test (e.g., 25-hydroxy vitamin D) is typically used. This intake assessment can guide dietary counseling or supplement recommendations but should be interpreted alongside other clinical factors.
Short name
Vitamin D Intake Check (24h)
Frequently asked questions
What does a low/high intake mean on this test?
Can I fast before this test?
Is this test the same as a vitamin D blood 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