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24-Hour Vitamin B2 (Riboflavin) Intake Assessment

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

This test measures how much riboflavin (vitamin B2) you consumed over the past 24 hours. It helps evaluate dietary intake rather than blood levels.

Quick summary

["Assesses dietary riboflavin consumption to check for adequate vitamin intake."]

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

Key facts at a glance

LOINC
81070-5
Short code
Vit B2 intake 24h Est
Synonyms
Vit B2 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 Measures

This test focuses on the total amount of riboflavin consumed from food and beverages in the last 24 hours. It does not measure riboflavin levels in your body fluids or tissues.

Why It Matters

Riboflavin is essential for energy production, healthy skin, and proper nerve function. Tracking intake helps ensure you’re meeting nutritional needs, especially if you have dietary restrictions or health conditions requiring careful vitamin monitoring.

How It’s Done

You’ll be asked to record all riboflavin-containing foods and drinks consumed during the 24-hour period. A healthcare provider may provide a checklist or instructions to simplify tracking.

What to Expect Before the Test

No special preparation is needed beyond accurately reporting your dietary intake. If you’re unsure about certain foods (e.g., fortified cereals, supplements), note them for accuracy.

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 B2 Intake (24h)

Frequently asked questions

Low riboflavin intake over time may indicate poor dietary habits or underlying conditions affecting absorption. This test helps identify potential deficiencies early, allowing adjustments to diet or supplements if needed.
This test alone doesn’t diagnose deficiencies—it’s part of a broader evaluation. If results are concerning, your doctor may recommend blood tests or other assessments to check for riboflavin status.
How long does it take to get results?
Results are typically processed within 1–2 business days after submission. Follow-up with your healthcare provider if you have questions about your intake or results.
Can I take supplements to boost my riboflavin intake?
Yes, but only under medical advice. Excessive intake from supplements isn’t harmful but may mask dietary deficiencies if you’re not eating enough riboflavin-rich foods.
  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