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Vitamin B2 (Riboflavin)
88.00
This test measures Vitamin B2 (Riboflavin) levels linked to energy and cellular function. Deficiency can affect skin, nerves, and metabolism.
Turnaround time
8 days
Biomarkers count
1
Same-Day Appointments
UKAS Accredited Labs
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Under 18? Patients under 18 can only be seen at GB Medlabs and Clinilabs, Monday to Friday only.
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Details about Vitamin B2 (Riboflavin)
What is a Vitamin B2 test?
A Vitamin B2 test measures the level of riboflavin in your blood. Riboflavin is essential for energy production within cells and plays a key role in converting food into usable energy.
It also supports skin integrity, nerve function, eye health, and the metabolism of other B vitamins such as B6 and B12.
Why do I need a Vitamin B2 test?
Riboflavin deficiency is often overlooked and can present with vague symptoms related to fatigue and skin problems.
Reasons for testing include:
• Persistent fatigue
• Cracked lips or mouth corners
• Sore tongue
• Skin rashes
• Light sensitivity or eye discomfort
• Poor diet or restrictive diet
• Digestive or absorption issues
Benefits of the test
1. Assesses cellular energy production
2. Helps explain fatigue
3. Supports skin and mucosal health assessment
4. Important for nerve function
5. Detects hidden B vitamin deficiency
6. Supports metabolism of other B vitamins
7. Useful in digestive or malabsorption issues
8. Guides nutritional supplementation
Expanded benefit explanation
Vitamin B2 is central to energy metabolism and tissue health. Identifying deficiency allows correction of symptoms related to fatigue and skin integrity.
Step-by-step — How testing works
We offer two UK-wide testing options:
Clinic testing
• Choose nearest UK clinic
• Blood sample collected
• Laboratory analysis performed
• Results securely returned
Home visit (+£60)
• Phlebotomist visits you
• Blood sample collected safely
• Sample sent to lab
• Results delivered confidentially
Your results explained
Low levels
May indicate poor diet, malabsorption, or increased metabolic demand.
Normal levels
Indicates adequate riboflavin status.
High levels
Usually due to supplementation.
How It Works
Simple steps to get your results
1
Book Online
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
2
Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
3
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
Take control of your health with London Blood Tests
WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.
Frequently Asked Questions
It measures plasma riboflavin, the most accurate indicator of vitamin B2 status.
No fasting is required.
If you take high-dose B-complex supplements, inform the clinician. Avoid taking them the morning of your test unless medically advised.
Yes. Riboflavin deficiency is linked to migraine frequency, and supplementation is often used in treatment plans.
Yes — a phlebotomist can visit your home or hotel anywhere in the UK.
Usually within 1–3 business days.
Poor intake, vegan diets, malabsorption, chronic illness, high stress, and excessive alcohol use.
Supplementation and dietary adjustments can correct deficiency rapidly. Our GP can recommend dosing.
It supports energy metabolism, antioxidant protection, red blood cell production, skin health, and nerve function.
Every 6–12 months, or sooner if supplementing or managing a deficiency.
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