Want insight into your biotin levels? Start with a vitamin B7 test.
Biotin, also known as vitamin B7, plays an important role in helping your body convert food into energy and supporting normal metabolic function. This test measures the level of biotin in your blood, providing insight into your vitamin B7 status.
Understanding your biotin levels may be helpful if you've recently changed your diet, take supplements, have concerns about nutrient absorption, or want a better picture of your nutritional health.
This blood test measures biotin levels as one part of a bigger health picture. Results should be reviewed with a healthcare professional, who can interpret your biotin levels in the context of your overall health, health history, diet, supplements, medicines, and any symptoms or concerns you may have.
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Preparation: No special preparation needed
Biotin is a B vitamin found in foods and supplements. It helps your body turn carbohydrates, fats, and proteins into energy and supports normal metabolism. Biotin also plays an important role in maintaining healthy hair, skin, nails, and nervous system function. Most people get enough biotin from foods such as eggs, meat, fish, nuts, seeds, and dairy products. A vitamin B7 (biotin) test measures the level of biotin in your blood. Lower biotin levels may be seen in some people with reduced dietary intake, conditions that affect nutrient absorption, pregnancy, long-term use of certain anticonvulsant medications, or other factors that affect biotin status. Higher levels may occur in people taking biotin-containing supplements. A healthcare professional can help explain what your result may mean for you.
A vitamin B7 test can help you understand your current biotin levels as part of a broader picture of your nutritional health.
Biotin deficiency is uncommon, but low biotin levels may be associated with signs such as hair thinning, brittle nails, or certain skin changes. These symptoms can occur for many reasons and are not specific to low biotin levels. A biotin blood test may be used to evaluate vitamin B7 status in the setting of symptoms or concerns, while keeping results as one part of a bigger health review.
A biotin blood test may offer insights if you want to better understand factors that may influence your vitamin B7 levels. These factors may include dietary patterns, supplement use, pregnancy, long-term anticonvulsant use, or concerns about how well your body absorbs nutrients. Results should be considered alongside other health information because a biotin level alone does not identify the cause of a low or high result.
1. Labcorp. 070097: Vitamin B7. Labcorp Test Menu. Accessed June 19, 2026. https://www.labcorp.com/tests/070097/vitamin-b7
2. National Institutes of Health, Office of Dietary Supplements. Biotin fact sheet for consumers. Accessed June 19, 2026. https://ods.od.nih.gov/factsheets/Biotin-Consumer/
3. National Institutes of Health, Office of Dietary Supplements. Biotin: health professional fact sheet. Accessed June 19, 2026. https://ods.od.nih.gov/factsheets/Biotin-HealthProfessional/
4. MedlinePlus. Vitamin B test. U.S. National Library of Medicine. Accessed June 19, 2026. https://medlineplus.gov/lab-tests/vitamin-b-test/
<p>1. Labcorp. <b>070097: Vitamin B7</b>. Labcorp Test Menu. Accessed June 19, 2026. <a rel="noopener noreferrer" title="vitamin-b7" target="_blank" href="https://www.labcorp.com/tests/070097/vitamin-b7">https://www.labcorp.com/tests/070097/vitamin-b7</a><a href="https://www.labcorp.com/tests/070097/vitamin-b7"></a></p> <p>2. National Institutes of Health, Office of Dietary Supplements. <b>Biotin fact sheet for consumers</b>. Accessed June 19, 2026. <a rel="noopener noreferrer" title="Biotin-Consumer" target="_blank" href="https://ods.od.nih.gov/factsheets/Biotin-Consumer/">https://ods.od.nih.gov/factsheets/Biotin-Consumer/</a><a href="https://ods.od.nih.gov/factsheets/Biotin%20-Consumer/"></a></p> <p>3. National Institutes of Health, Office of Dietary Supplements. <b>Biotin: health professional fact sheet</b>. Accessed June 19, 2026. <a rel="noopener noreferrer" title="Biotin-HealthProfessional" target="_blank" href="https://ods.od.nih.gov/factsheets/Biotin-HealthProfessional/">https://ods.od.nih.gov/factsheets/Biotin-HealthProfessional/</a><a href="https://ods.od.nih.gov/factsheets/Biotin-HealthProfessional/"></a></p> <p>4. MedlinePlus. <b>Vitamin B test</b>. U.S. National Library of Medicine. Accessed June 19, 2026. <a rel="noopener noreferrer" title="vitamin-b-test" target="_blank" href="https://medlineplus.gov/lab-tests/vitamin-b-test/">https://medlineplus.gov/lab-tests/vitamin-b-test/</a></p>
Simply purchase this test online. A healthcare provider will review and approve your test requests; no healthcare provider visit is required.
Visit a Labcorp location near you for sample collection. Visits may be scheduled online.
View your easy-to-read results online in your Labcorp Patient™ account, including Linked Accounts. For certain results that require prompt attention, you will also be contacted by phone or mail.
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Biotin (vitamin B7) levels can be measured with a blood test that evaluates the amount of biotin circulating in your blood.
No single test provides a complete picture of nutritional health. Biotin test results are one piece of information that should be considered together with other health and nutrition factors.
Low biotin levels can affect multiple systems in the body. Common symptoms of biotin deficiency may include:
Because these symptoms can be associated with many different health conditions, it's important to talk with a healthcare provider if you're concerned about a possible vitamin deficiency.
A blood test can measure your biotin level but results alone cannot determine whether low biotin levels are causing your symptoms. A low vitamin B7 (biotin) level may be suspected based on symptoms such as hair thinning, brittle nails, skin changes, or fatigue. However, these signs alone cannot confirm a biotin deficiency. A healthcare provider can review your symptoms, medical history, and dietary habits and determine whether laboratory testing or further evaluation is appropriate. Since true biotin deficiency is rare in healthy individuals, professional assessment is the best way to determine whether low B7 levels may be contributing to your symptoms.
If you take biotin supplements, including many over-the-counter hair, skin, and nail vitamins, they may affect the results of other blood tests. Biotin can cause some lab test results to appear falsely high or falsely low, including tests for:
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To align with clinical best practices, we’ve set an age maximum of 100 for consumer-initiated testing. This limit was set to encourage individuals in more advanced age groups - who may have complex medical needs - to receive personalized guidance about testing from their healthcare providers.
