Hospital
$100+
Other Labs
$35
TestWell
$25.99
Vitamin B12 is crucial for nerve function, DNA synthesis, red blood cell production, and brain health. Deficiency can cause fatigue, weakness, numbness and tingling, memory problems, and anemia. It's especially common in vegans/vegetarians, older adults, and those taking certain medications like metformin or proton pump inhibitors.
Sample Type
Blood draw
Fasting
Not required
Results In
2–4 business days
Performed By
BioReference
1 biomarker tested
Your Vitamin B12 results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 2–4 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you.
No fasting required. Biotin supplements may interfere — stop 72 hours before.
TestWell Price
$25.99
No insurance needed · HIPAA compliant
Frequently ordered together
Customers who ordered Vitamin B12 also added these for a more complete health picture.
Complete blood count with white blood cell breakdown — the gold standard for overall blood health screening.
$21.99
The primary screening test for thyroid function — detects both overactive and underactive thyroid.
$26.99
Measures your body's iron stores — the most sensitive early indicator of iron deficiency.
$24.99
Vitamin B12
$25.99