Checking for MTHFR can be done through your doctor and will be covered by some insurance plans if it is ordered because of blood clots, high homocysteine that isn’t responding to treatment, or fertility issues. You can also order testing yourself in a variety of ways. I feel the best value for money is by using a genetic analysis tool such as Ancestry.com (starting at $129) or 23andme.com (starting at $99). The genetic testing is comparable on both platforms and the least expensive test will still give you all of the raw genetic data, but access to fewer of their internal health or ancestry trait reports. Once you get your genetic data from these services, it is possible to download the raw data file and upload it into a variety of different services to see your MTHFR as well as a variety of different other variants. My favorite of these for ease of understanding is the methylation panel from geneticgenie.org, for which they ask a small donation. If you prefer to order a medical-style test yourself which has targeted genetic information, then I feel the best available is the strategene test. You can upload your raw data from 23andme or ancestry for $95.