Biotin (Vitamin B7)

The Biotin (Vitamin B7) test contains 1 test with 1 biomarker.

Brief Description: The Vitamin B7 test, also known as a biotin test, is a laboratory test designed to measure the level of biotin (vitamin B7) in the blood. Biotin is a water-soluble B-vitamin that plays a crucial role in the metabolism of fats, carbohydrates, and proteins. It also is vital for healthy hair, skin, and nails. The test is conducted by drawing a blood sample from a vein in the arm, which is then sent to a laboratory for analysis.

Collection Method: Blood Draw

Specimen Type: Serum

Test Preparation: No preparation required

When and Why a Vitamin B7 Test May Be Ordered

A Vitamin B7 test may be ordered when an individual presents symptoms suggestive of a biotin deficiency or excess. Such symptoms could include hair loss, skin rashes, fungal infections, or neurological symptoms like depression, exhaustion, hallucinations, or tingling of the arms and legs. Moreover, individuals with certain genetic disorders affecting biotin metabolism might be tested for biotin levels as part of their routine monitoring. This test could also be ordered if malnutrition or malabsorption is suspected, or to monitor the efficacy of biotin supplementation.

What a Vitamin B7 Test Checks For

A Vitamin B7 test checks for the levels of biotin in the blood to ascertain whether an individual has a biotin deficiency or excess. The normal range of biotin levels can vary, but a level below the established reference range might indicate a deficiency, while a level above may indicate excess or supplementation.

Other Lab Tests Ordered Alongside Vitamin B7 Test

When a Vitamin B7 test is ordered, it's typically part of a broader evaluation of nutritional status and specific symptoms. Here are some tests commonly ordered alongside it:

  1. Complete Blood Count (CBC):

    • Purpose: To evaluate overall blood health, including red and white blood cells, and platelets.
    • Why Is It Ordered: To assess for signs of anemia or other blood cell abnormalities, which can occur in various nutritional deficiencies.
  2. Comprehensive Metabolic Panel (CMP):

    • Purpose: To assess general health status, liver and kidney function, electrolyte and acid/base balance, and blood glucose levels.
    • Why Is It Ordered: To provide a broad overview of metabolic function and to detect any underlying health issues.
  3. Other B Vitamin Levels (e.g., B12, B6, Folate):

    • Purpose: To measure levels of other B vitamins.
    • Why Is It Ordered: To evaluate for deficiencies in other B vitamins, which often occur together and can present with similar symptoms.
  4. Iron and Ferritin Levels:

    • Purpose: To assess iron status.
    • Why Is It Ordered: To rule out iron deficiency, which can cause symptoms similar to biotin deficiency, such as hair loss.
  5. Thyroid Function Tests:

    • Purpose: To assess thyroid gland function.
    • Why Is It Ordered: To determine if thyroid dysfunction is contributing to symptoms like hair loss or skin changes.
  6. Urinalysis:

    • Purpose: To test urine for various substances, including proteins and sugars.
    • Why Is It Ordered: To check for the presence of organic acids, which might be elevated in biotin deficiency.

These tests, when ordered alongside a Vitamin B7 test, provide a comprehensive evaluation of nutritional status and help in the diagnosis of symptoms potentially related to biotin deficiency. They are crucial for identifying the cause of symptoms like hair loss, skin rashes, and neurological issues, and for guiding appropriate dietary and medical interventions. The specific combination of tests will depend on the individual’s symptoms, dietary habits, and overall health status.

Conditions or Diseases Requiring a Vitamin B7 Test

Conditions that might require a Vitamin B7 test include suspected biotin deficiency or excess, certain genetic disorders affecting biotin metabolism, and symptoms like hair loss, skin rashes, or neurological issues without a clear cause. Individuals with a history of malnutrition, malabsorption disorders, or those on long-term anticonvulsant therapy might also be candidates for a Vitamin B7 test.

How Health Care Providers Use the Results of a Vitamin B7 Test

Health care providers use the results of a Vitamin B7 test to identify a biotin deficiency or excess, which can help in diagnosing underlying conditions or monitoring the efficacy of biotin supplementation. If a deficiency is identified, a healthcare provider may recommend dietary changes or biotin supplementation. Similarly, if an excess of biotin is detected, particularly if the individual is taking biotin supplements, the healthcare provider might advise a reduction in the dose. Moreover, identifying and addressing biotin levels can be a component of managing symptoms like hair loss or skin disorders, thereby improving the individual’s quality of life.

Most Common Questions About the Biotin (Vitamin B7) test:

Understanding Vitamin B7

What is the significance of Vitamin B7 and why is it tested?

Vitamin B7, also known as biotin, plays a critical role in the body. It's necessary for the functioning of the Krebs Cycle, through which energy is produced from nutrients, and it helps in the maintenance of hair, skin, and nails. A Vitamin B7 test can be used to determine whether an individual has a deficiency or excess of biotin. Deficiencies are rare but can cause symptoms like hair loss, skin rashes, and brittle nails.

What conditions or symptoms might prompt a Vitamin B7 test?

A Vitamin B7 test might be advised if an individual is showing signs of biotin deficiency which include hair loss, a scaly red rash around the eyes, nose, mouth, and genital areas, or neurological symptoms like depression, lethargy, hallucination, and numbness and tingling in the extremities. Additionally, the test may be suggested for individuals who have had prolonged intravenous feeding, as they may be at risk for biotin deficiency.

Understanding Test Results

How are the results of the Vitamin B7 test interpreted?

The results of a Vitamin B7 test are usually measured in nanograms per deciliter (ng/dL). A normal range is considered to be between 300 to 1200 ng/dL, although the exact range can vary between laboratories. If the biotin level is lower or higher than the normal range, it may indicate a deficiency or excess of biotin respectively. It's important to note that a single test may not provide a definitive diagnosis, and the results may need to be interpreted along with other tests and assessments by a healthcare provider.

What could falsely elevated or depressed levels of Vitamin B7 indicate?

Falsely elevated or depressed levels of Vitamin B7 could be due to several factors. It could be influenced by the intake of supplements or medications, or even lab errors. Some people might consume high doses of biotin supplements which can interfere with the test results, leading to inaccurate readings. Moreover, certain medical conditions can affect biotin levels. It's essential that all supplements and medications are disclosed to the healthcare provider before testing, to ensure accurate interpretation of the results.

Interaction with Other Nutrients and Medications

How does Vitamin B7 interact with other vitamins and minerals in the body?

Vitamin B7 interacts with various other nutrients in the body to facilitate its functions. For instance, it works together with other B vitamins to help convert food into energy. It also helps in the metabolism of fats, carbohydrates, and proteins. Understanding how biotin interacts with other nutrients is crucial for a comprehensive understanding of an individual’s nutritional status and overall health.

Can certain medications affect the levels of Vitamin B7 in the body?

Yes, certain medications can affect the levels of Vitamin B7 in the body. For example, anticonvulsant medications can reduce biotin absorption, leading to a deficiency. Moreover, long-term use of antibiotics can affect biotin levels as they kill the gut bacteria that produce biotin.

General Information about the Test

What are the benefits of getting a Vitamin B7 test?

Getting a Vitamin B7 test can be beneficial in understanding an individual's nutritional status, especially if they are experiencing symptoms of a deficiency or if they are at risk for biotin deficiency due to certain medical conditions or treatments. Early detection and management of a biotin deficiency can prevent potential complications such as hair loss, skin problems, or neurological symptoms. Moreover, it can provide valuable information to healthcare providers, aiding in a more comprehensive approach to patient care.

We advise having your results reviewed by a licensed medical healthcare professional for proper interpretation of your results.

The following is a list of what is included in the item above. Click the test(s) below to view what biomarkers are measured along with an explanation of what the biomarker is measuring.

Also known as: Vitamin B7 Biotin

Vitamin B7 (Biotin)

*Process times are an estimate and are not guaranteed. The lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.

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