Methylmalonic Acid (MMA)
Currently unavailable in your state.
A more sensitive marker of B12 deficiency that often rises before serum B12 falls.
- Member pricing close to cost, no upsells
- Schedule online, typical results in 3-6 days
- Clear guidance, results reviewed by a real clinician
- Follow-up care available
HSA/FSA eligible
About this test
Methylmalonic acid (MMA) is a small molecule produced when the body breaks down certain amino acids and fats. Vitamin B12 is the cofactor that converts MMA into succinate, so when B12 is in short supply, MMA accumulates in the blood, often in the early stages while serum B12 still reads normal or low-normal. That early rise makes MMA the test of choice to confirm B12 deficiency when symptoms point that way: fatigue, numbness or tingling, balance problems, memory trouble, low mood, or unexplained macrocytic anemia, especially in older adults who can have neurological signs without anemia.
This is the serum MMA test, the standard way to confirm functional B12 status and to track whether B12 supplementation is working. A urine MMA (creatinine-ratio) version exists for the same metabolic question, and the combined MMA and homocysteine panel adds homocysteine to widen the workup. If you supplement B12, MMA also tells you whether the dose is actually correcting the deficiency.
Consider it if
- Numbness, tingling, balance issues, brain fog, or low mood that may point to B12 deficiency
- Borderline or low-normal serum B12 that needs a clearer answer
- Macrocytic anemia, pernicious anemia, gastrectomy, or malabsorption raising B12 deficiency risk
- A long-term vegan or vegetarian diet, or age over 60
- Checking whether B12 injections or supplements are correcting a known deficiency
Why are there member and non-member prices?
Members get Mito's no-markup price on tests. The non-member price is the standard price.
Mito membership is $9/month and unlocks member pricing across the catalog. It's how Mito is supported, so we don't have to mark up your tests or earn more when you buy more. Your member savings are applied at checkout.
Video call with clinician
Speak with a real clinician to discuss your labs.
What's included
What's tested
This test measures a single biomarker: Methylmalonate.
Test details
- Sample type
- Blood sample (serum or plasma)
- Collection
- Partner lab visit
- Preparation
- No fasting required
- Results in
- Typical results in 3-6 days
Pre-test considerations
No strict fasting is required. If you take B12 supplements or receive injections, note the dose and timing, since active repletion lowers MMA and is exactly what a follow-up test is checking. For a clean baseline assessment of deficiency, discuss with your clinician whether to test before starting or restarting B12.
Results in as little as 1-2 business days
- 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 Results in 1-2 business days
Your results post to your dashboard fast — then a clinician reviews them and your personalized action plan follows.
- 4 Expert guidance
Our clinicians will recommend next steps. Or book a same-day visit for comprehensive care.
Everything your health needs,
in one membership
-
Cost-plus on every test you order
Members pay close to cost on every test, with lab fees passed straight through. The full receipt is itemized, never padded.
-
Continuous tracking, all in one place
Upload past labs and watch your trends over time. Every marker and visit lives in one longitudinal record, so all your care stays together.
-
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.
Mito Membership
$9 /mo
cancel anytime
Without membership
$0
pay as you go
Near-cost pricing on labs, scans, and more
Priority turnaround on your results
On-demand clinician consults when you need guidance
Personalized action plans across supplements, exercise, nutrition, and sleep
AI health coaching to help you act on your results
Year-round medical support, with in-chat clinician escalation
All your health records in one personal vault, with trends and biological age tracking
Early access to new diagnostics and product releases
More tests to consider
Loading essentials…
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. Your price is our cost plus a small amount 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. Members pay even less, applied at checkout (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 are typically visible within 1-2 business days of your lab visit. A clinician then reviews them, and your full analysis and personalized action plan — with clear next steps — follow once that review is complete. Specialty assays and at-home kits take longer; each test shows its 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.