Quest Diagnostics Vitamin B12 Test
Type
Blood Testing
Biomarkers
2
Duration
30 min
Results
4 days
Blood test measuring vitamin B12 levels to identify deficiencies.
Vitamin B12 is crucial for red blood cell production, nervous system health, and DNA creation. This test measures B12 levels in the blood, identifying deficiencies potentially caused by diet, absorption issues, age, or health conditions. Deficiencies can lead to anemia, neurological problems, and other health issues. Early detection is key to preventing irreversible damage. The test helps assess B12 status and guide treatment if needed.
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
2Essential 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