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Vitamin B2 (Riboflavin) Intake Over 24 Hours Measured

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 of the vitamin.

Quick summary

["This test helps assess whether your diet meets recommended vitamin B2 intake levels over a full day."]

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

Key facts at a glance

LOINC
81071-3
Short code
Vit B2 intake 24h Measured
Synonyms
Vit B2 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 of vitamin B2 deficiency (like fatigue, sore throat, or skin changes) or if you’re being monitored for dietary habits affecting nutrient intake. It’s also used in research or specialized dietary studies.

How the Test Works

You’ll keep a food/drink log for 24 hours, recording everything you eat and drink. A lab technician analyzes the recorded intake to estimate riboflavin consumption.

Sample Collection

No blood or bodily fluid sample is drawn for this test. Instead, you’ll document your intake via a provided log or digital tool.

Preparation

No special preparation is needed. Simply follow your usual eating habits while recording your food/drink intake accurately.

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

24-Hour Riboflavin Intake Assessment

Frequently asked questions

Low riboflavin intake may lead to deficiencies, which can cause neurological issues, skin problems, or weakened immune function. This test helps identify if your diet lacks sufficient vitamin B2 over time.
What does a low or high intake mean?
A low intake may indicate poor dietary habits or specific dietary restrictions. A high intake could suggest excessive consumption of foods rich in riboflavin (e.g., dairy, fortified foods). Results help guide dietary counseling or adjustments.
Can this test detect vitamin B2 levels in my blood?
No, this test does not measure blood levels of riboflavin. It focuses solely on dietary intake over 24 hours.
Results are typically reviewed by a healthcare provider to assess dietary patterns. Frequency depends on individual health goals, such as monitoring nutritional status in clinical studies or specific dietary plans.
  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