Urinary riboflavin test: meaning, levels and interpretation

The urinary riboflavin test measures vitamin B2 excretion in urine and reflects recent intake. Normal riboflavin urine levels are typically above 80 µg/g creatinine in adults. High levels usually indicate supplementation, while low levels suggest deficiency or malabsorption. This vitamin B2 urine test meaning helps assess nutritional status and absorption efficiency.

Contents

→ Result interpretation
→ Check your value Urinary Riboflavin
→ What is Urinary Riboflavin
→ Reference ranges
→ Causes of abnormal values
→ Urinary Riboflavin in combination with other markers
→ Possible symptoms
→ When to see a doctor
→ What to do if abnormal
→ Frequently asked questions
→ Related markers

Result interpretation Urinary Riboflavin

What your result means based on common reference ranges

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Normal

Urinary riboflavin levels within range indicate adequate intake and normal vitamin metabolism without signs of deficiency.

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Mildly elevated

Mildly elevated urinary riboflavin levels often reflect recent vitamin supplementation or increased dietary intake without clinical toxicity.

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Significantly elevated

Severely high urinary riboflavin levels usually result from high-dose supplementation or intravenous therapy, not kidney dysfunction.

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Below normal

Low urinary riboflavin levels suggest vitamin B2 deficiency, often linked to malnutrition, alcohol use, or malabsorption disorders.

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Urinary Riboflavin, µg/g creatinine

Sex

Age

What is Urinary Riboflavin?

Urinary riboflavin is a marker of recent vitamin B2 intake and metabolic status. Riboflavin plays a key role in energy metabolism, redox reactions, and cellular function. Unlike fat-soluble vitamins, excess is rapidly excreted, making this urine test useful for short-term assessment. Low levels may be linked to malnutrition, alcohol use, or malabsorption disorders such as celiac disease. This test is often interpreted alongside EGRAC test or FMN riboflavin status to evaluate deficiency and metabolic function in clinical practice.

Reference ranges

Group	Normal range	Unit
Men	80 – 300	µg/g creatinine
Women	80 – 300	µg/g creatinine
Children	150 – 400	µg/g creatinine
Pregnant	120 – 350	µg/g creatinine

Causes of abnormal values

Causes of low Urinary Riboflavin

• Poor diet — insufficient intake of dairy, eggs, and meats reduces levels
• Chronic alcohol use — impairs absorption and metabolism of riboflavin
• Malabsorption disorders — intestinal damage limits vitamin uptake
• Phototherapy exposure — light degrades riboflavin in the body

Causes of high Urinary Riboflavin

• High-dose B2 supplementation — excess intake leads to rapid renal excretion
• Multivitamin use — increased intake exceeds metabolic needs
• Energy drink consumption — fortified products elevate riboflavin excretion
• Intravenous vitamin therapy — bypasses absorption and increases serum load
• Fortified food intake — enriched cereals raise short-term levels
• Fasting or catabolism — tissue breakdown releases riboflavin into circulation

Urinary Riboflavin in combination with other markers

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Low Urinary Riboflavin + High EGRAC Confirms chronic riboflavin deficiency with impaired enzyme activity and cellular metabolism dysfunction.

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Low Urinary Riboflavin + Low Urinary Thiamine Suggests combined B-vitamin deficiency due to malnutrition or alcohol-related metabolic impairment.

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High Urinary Riboflavin + Normal Creatinine Indicates excess intake with normal kidney function and no renal pathology.

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High Urinary Riboflavin + Neon Yellow Urine Reflects harmless vitamin excretion, not liver or kidney disease.

Possible symptoms

•Cracks at mouth corners (cheilosis)
•Glossitis with red or swollen tongue
•Seborrheic dermatitis around face
•Light sensitivity (photophobia)
•Red or irritated eyes

When to see a doctor

Consult a doctor if urinary riboflavin levels fall below 27 µg/g creatinine or symptoms of deficiency appear. Seek evaluation if low levels persist despite adequate diet or are accompanied by digestive issues or fatigue.

What to do if abnormal

🥛 Increase intake of dairy, eggs, and lean meats
💊 Review supplements if levels are excessively high
🥗 Improve diet diversity with leafy greens and nuts
🌞 Protect foods from light exposure to preserve vitamin B2
🧪 Check for malabsorption if levels remain low

The information on this page is intended for general understanding of test results and does not replace medical consultation. Accurate interpretation requires considering other blood markers and individual factors.

Content is based on medical literature and used within the PulseBook analytical system.

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Frequently asked questions

What is the urinary riboflavin test used for?

The urinary riboflavin test evaluates vitamin B2 status by measuring how much riboflavin is excreted in urine. It reflects recent intake over 24–48 hours and helps identify deficiency or excess. It is commonly used alongside other markers like the EGRAC test to assess metabolic and nutritional health.

What is the normal riboflavin urine levels normal range?

Normal urinary riboflavin levels are typically above 80 µg/g creatinine in adults. Values below 27 µg/g indicate deficiency, while intermediate levels suggest insufficient intake. Results may vary slightly depending on laboratory standards and hydration status.

What causes low riboflavin urine levels?

Low riboflavin urine levels causes include poor diet, alcohol use, and malabsorption conditions such as celiac disease. These factors reduce vitamin absorption or intake, leading to deficiency and related symptoms like skin changes and fatigue.

What is the vitamin B2 urine test meaning?

The vitamin B2 urine test meaning refers to assessing how much riboflavin your body excretes. Since excess B2 is eliminated in urine, this test reflects recent intake and helps determine whether your diet provides sufficient vitamin B2.

What is the EGRAC test and how is it related?

The EGRAC test measures enzyme activity dependent on riboflavin in red blood cells. While urinary riboflavin reflects short-term intake, EGRAC indicates long-term deficiency, making them complementary tests for evaluating vitamin B2 status.

How long does riboflavin stay in your system?

Riboflavin is water-soluble and not stored in large amounts. It typically remains in the body for a short time, with excess excreted within 24–48 hours. This is why urinary riboflavin is a good marker of recent intake rather than long-term status.

What are riboflavin deficiency symptoms?

Riboflavin deficiency symptoms include cracks at the mouth corners, red tongue, skin rashes, and eye irritation. These signs develop when vitamin B2 levels remain low over time and affect cellular metabolism and tissue repair.