Vitamin B12 (Cobalamin)
A key B vitamin behind energy, nerve function, and red blood cell production.
Consider this test if:
- Unexplained fatigue, brain fog, numbness or tingling, or poor concentration
- An MCV above 100 or anemia found on a blood count
- Following a vegan or vegetarian diet, or taking metformin or long-term acid reducers
- Confirming whether B12 supplements or injections are restoring your level
- Investigating malabsorption, pernicious anemia, or neurological symptoms
- HSA/FSA eligible
- Typical results in 1 day · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations
A fasting sample is preferred but not strictly required. Draw before starting B12 therapy or after a transfusion, since both alter the result. If you supplement B12, recent doses or injections raise the reading, so note your routine and timing for an accurate baseline.
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What this test is for
Vitamin B12 (cobalamin) is essential for making red blood cells, maintaining the myelin that insulates nerves, and supporting DNA synthesis. Low B12 contributes to fatigue, weakness, brain fog, poor concentration, numbness or tingling in the hands and feet, and macrocytic or megaloblastic anemia, and deficiency is common with pernicious anemia, malabsorption, strict vegan diets, and long-term use of metformin or acid-reducing drugs. High B12 is less often a goal and usually reflects supplementation, liver cell damage, or certain blood disorders. This test measures total B12 in serum, the standard status check; the separate Vitamin B12 and Folate Panel adds folate, useful because the two deficiencies cause overlapping anemia and neurological symptoms and are often evaluated together. If you take B12 by supplement or injection, note the dose and timing, since both raise the result and can mask an underlying deficiency.
What to expect
- 1 Book instantly
Click, book, done. Choose a convenient lab location near you. Transparent, up-front pricing.
- 2 Quick lab visit
Testing to fit your busy schedule, usually 15 minutes or less. Walk-in and appointments available.
- 3 Typical results in 1 day
Your results post straight to your dashboard as soon as the lab completes them.
- 4 Expert guidance
Included with Mito membership. A clinician reviews your results and your personalized action plan follows, with clear next steps.
Everything your health needs,
in one membership
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Every test at our cost
Members pay our cost on every test, with lab fees passed straight through. The full receipt is itemized, never padded.
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Upload past labs and watch your trends over time. Every marker and visit lives in one longitudinal record, so all your care stays together.
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Year-round clinician support
Text anytime and get clinician-reviewed answers. When you want to go deeper, 1:1 consultations are available at affordable rates.
All for $9/month
Order any test or consult without joining. For $9/month, members unlock member prices, trend tracking, and year-round clinician guidance.
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Frequently asked questions
View all FAQsHow does pricing work?
Every test shows the member price next to the standard non-member price, so you can see what membership saves you. The member price is our cost — covering the lab and what it takes to run the service — never a profit on the test itself; Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9/mo, and you still pay the lab’s order fee. Prices are itemized before you pay, with no hidden fees.
Where do I get tested?
Choose a partner lab (Quest, Labcorp, or BioReference) at checkout. If your cart spans multiple tests, we consolidate the whole order onto a single lab so you only make one visit.
Is this eligible for HSA/FSA?
Yes. This test is HSA/FSA eligible, and you can pay with your HSA/FSA card at checkout.
When will I get my results?
Your results post to your dashboard once your lab completes them, then a clinician reviews them and your full analysis and personalized action plan (with clear next steps) follow. Turnaround varies by test: specialty assays and at-home kits take longer, and each test shows its expected turnaround before you buy.
Do I need a doctor’s order?
No. Mito provides the lab order for you, so you can book and get tested without a separate doctor visit.
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