You can get MTHFR testing through your doctor’s office, major national laboratories like Quest Diagnostics, or direct-to-consumer genetic testing companies that ship collection kits to your home. The cost ranges from about $65 to $800 depending on which route you choose, and most options don’t require any special preparation like fasting.
Through Your Doctor’s Office
The most straightforward path is asking your primary care provider or a genetic counselor to order the test. Your doctor sends you to a lab for a standard blood draw, and results come back showing whether you carry variants in the MTHFR gene. Quest Diagnostics and other major clinical labs offer MTHFR DNA mutation analysis, and your doctor’s office likely already has an account with one of these labs.
That said, your doctor may not order the test without a specific reason. Most providers will only check for MTHFR variants if a separate blood test has already shown elevated homocysteine levels, if a newborn screens positive for homocystinuria, or if you’re being prescribed methotrexate (a medication where MTHFR status can influence safe dosing). If you’re requesting the test out of general curiosity or because you’ve read about it online, you may get pushback, which is where direct-to-consumer options come in.
Direct-to-Consumer Testing
Several companies let you purchase MTHFR testing without a doctor’s order. You buy the test online, receive a collection kit at home (usually a saliva sample or cheek swab), mail it back, and get results through an online portal. These tests typically cost between $65 and $249. Companies like Invitae accept saliva, buccal swab, or extracted DNA samples and can ship collection kits directly to you.
Quest also operates a consumer-facing service called Quest Health, where you can purchase lab tests yourself without a doctor’s visit, then walk into a nearby Quest location for sample collection and receive results online. This bridges the gap between clinical and at-home testing: you get the reliability of a major lab without needing a prescription.
The tradeoff with direct-to-consumer tests is that they come with limited clinical interpretation. You’ll get your genotype, but you won’t necessarily get guidance on what it means for your health. If your results show a variant, you’ll likely want to bring them to a provider who can put them in context.
Blood vs. Saliva: Does It Matter?
For a straightforward test like MTHFR genotyping, both blood and saliva produce equally accurate results. Blood is considered the gold standard for genetic testing because it yields more DNA of higher and more consistent quality, but MTHFR analysis looks at just one or two specific gene positions. It doesn’t require the large DNA quantities needed for whole-genome sequencing or rare-variant screening.
Saliva samples can occasionally be affected by contamination from food particles or bacteria, and DNA quality can vary based on hydration or oral health. In practice, reputable labs account for this, and failed samples simply get flagged for recollection. If you’re choosing between a blood draw at a lab and a saliva kit at home, convenience is a perfectly reasonable deciding factor for this particular test.
What the Test Actually Checks
MTHFR testing looks at two specific positions in the gene. The first, called C677T, checks whether the DNA base at position 677 is the typical “C” or the variant “T.” Your result will show one of three possibilities: CC (no variant copies), CT (one variant copy), or TT (two variant copies). The second position, A1298C, follows the same pattern: AA, AC, or CC.
Having one copy of a variant (heterozygous) is extremely common and generally not considered clinically significant. Even having two copies of the C677T variant (TT) has a more modest effect on the body’s ability to process folate than many wellness websites suggest. The MTHFR gene helps your body convert folate into its active form, and variants can reduce that enzyme’s efficiency, but this rarely causes problems on its own when your diet includes adequate folate.
Cost and Insurance Coverage
Here’s the reality that catches many people off guard: insurance, including Medicare, generally does not cover MTHFR testing. The Centers for Medicare and Medicaid Services explicitly classifies MTHFR genotyping as “not a Medicare benefit,” stating there is no clinical indication for it in any population. Private insurers largely follow the same logic.
If your doctor orders the test through a clinical lab, expect to pay $200 to $600 out of pocket. Comprehensive genetic panels that include MTHFR alongside other markers can run $300 to $800. Direct-to-consumer tests are the most affordable option at $65 to $249, though they come without the clinical oversight of a provider-ordered test. No matter which route you take, confirm pricing before the sample is collected so you aren’t surprised by a bill.
Why Some Doctors Won’t Order It
The American College of Medical Genetics published a practice guideline concluding that MTHFR polymorphism testing has “minimal clinical utility” and should not be part of routine evaluation for blood clotting disorders. The CDC takes a similar position, emphasizing that having an MTHFR variant is not a disease and that most people with variants have no health problems.
This doesn’t mean the test is useless in every situation. It can be genuinely helpful for guiding methotrexate dosing or investigating persistently high homocysteine levels that haven’t responded to standard B-vitamin supplementation. But for the broad category of “I want to know if I have a mutation,” the mainstream medical position is that the result rarely changes what your doctor would recommend. If your homocysteine is high, the treatment is the same regardless of your MTHFR status: folate and B vitamins. If your homocysteine is normal, an MTHFR variant doesn’t indicate a problem that needs solving.
What to Do With Your Results
If you test positive for one or two copies of either variant, the most common recommendation is ensuring you get enough folate, either through diet or supplements. Some providers suggest methylfolate (the already-active form of folate) rather than standard folic acid for people with two copies of the C677T variant, since their bodies are less efficient at making the conversion. This is a reasonable, low-risk approach, but it’s worth discussing with a provider rather than self-treating based on an online result.
If your test was ordered because of high homocysteine, your provider will likely check those levels again after a period of supplementation to see if they’ve normalized. The homocysteine level is ultimately what matters more than the genotype itself, because it reflects what’s actually happening in your body rather than what might theoretically happen based on your DNA.