Also known as: B12 Test, Cobalamin
Hospital Lab
$100
cash pay
Other Labs
$49
+ lab fees
TestWell
$25.99
+ $6 lab fee
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.
Essential for nerve function and red blood cell production. Deficiency causes fatigue, neuropathy, megaloblastic anemia, and (if prolonged) irreversible neurologic damage.
Vegans/vegetarians, anyone over 50, people on metformin or PPIs (both deplete B12), patients with unexplained fatigue, brain fog, tingling/numbness, or balance issues.
Sample Type
Blood draw
Fasting
Not required
Results In
2–4 business days
Performed At
Quest or Labcorp
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.
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.
No fasting required. Biotin supplements may interfere — stop 72 hours before.
TestWell Price
$25.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
Better value: the Basic Vitamin Deficiency Panel
Save $10.98This test is part of the Basic Vitamin Deficiency Panel — 3 tests · 3 biomarkers for $89.99, $10.98 less than à la carte.
$89.99$100.97
3 tests · 3 biomarkers
Frequently ordered together
Customers who ordered Vitamin B12 also added these for a more complete health picture.
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Vitamin B12
$25.99