Quest Diagnostics Biotin (Vitamin B7) Test
Type
Blood Testing
Biomarkers
3
Duration
30 min
Results
4 days
Blood test to measure biotin (vitamin B7) levels.
This biotin blood test helps determine the amount of biotin (vitamin B7) in your blood. Biotin is a water-soluble vitamin crucial for breaking down proteins, carbohydrates, and fats into energy. It also facilitates cell communication and gene regulation. Identifying and addressing nutrient deficiencies are important for better health, as your body doesn't produce most vitamins and minerals; you must obtain them through diet or supplements. Nutrient function depends on various factors including genetics, age, health conditions, medications, metabolism, and nutrient absorption.
Key Details
- Nutrients Tested
- 1–30+ (varies by panel)
- Fasting Required
- Varies by specific test
- Sample Type
- Blood draw
- Turnaround
- 2–5 business days
- Common Use
- Deficiency screening, supplementation guidance
Who Is This For?
Vegetarians and vegans (at higher risk of B12, iron, and zinc deficiency). Older adults, as nutrient absorption decreases with age. Anyone on restrictive diets or with digestive conditions affecting absorption. People experiencing unexplained fatigue, brain fog, poor wound healing, or hair loss. Athletes with high nutrient demands from training.
What's Included
Preparation Required
Fasting for 8–10 hours is recommended for some nutrient tests but not all — check with your provider. Continue taking your regular supplements unless told otherwise (the test measures your steady-state levels). Morning draws are preferred for consistent results.
Biomarkers Tested
3A metal found in canned foods, solder, and industrial materials. While small amounts of inorganic tin are relatively non-toxic, high levels can cause gastrointestinal irritation. Organotin compounds are more toxic and affect the immune and nervous systems.
Essential for nerve function, DNA synthesis, and red blood cell formation. B12 deficiency can cause anemia, neuropathy, fatigue, and cognitive impairment. Common in vegans, vegetarians, older adults, and those taking metformin or acid-reducing medications.
Essential for DNA synthesis, cell division, and red blood cell formation. Folate deficiency causes megaloblastic anemia and, during pregnancy, increases the risk of neural tube defects. Works closely with vitamin B12.
+ $6.00 Physician Service Fee
- Category
- Diagnostic
- Sample Type
- Blood draw
- Duration
- 30 min
- Results
- 4 days