@Mumlili9 The MTHFR mutation is a genetic mutation which can interfere with the body's ability to break down folic acid. It is believed to be linked to recurrent miscarriage so it's one of the things they will test for in recurrent miscarriage testing. There are two strains of it and you need to be tested for both of them. I was only tested for one originally, and when I went to see a new gynaecologist a few weeks ago he noticed that I'd only been tested for one strain and ordered a blood test for the other strain. (He also ordered blood tests for my husband for both strains. I don't know why, it's on my list of things to ask him.) Anyway, it turns out I have the strain I wasn't tested for back in October.
In terms of what it means for me, I would guess not much. The mutation I have is believed to be less likely to cause complications than the mutation I don't have. And it is also believed that lots of people have one or the other of the two mutations but they aren't tested for it because they never present with any health problems that could be linked to it.
Having the mutation increases the risk of raised homocysteine levels in the body, which can lead to miscarriage. The way you treat it is by supplementing with high dose methylfolate instead of folic acid, because methylfolate is more bioavailable. (It's already in the form that your body converts it to during the metabolic process.) I have already been taking methylfolate for about six months and I've had my homocysteine levels checked and they are low, so I don't think this will change anything at all in my case, but it's good to know, and something I will discuss with my gynaecologist when I see him tomorrow.
In a way, if you take methylfolate rather than folic acid, you don't need to know whether you have the mutation or not, because you'll already be taking the treatment for it, and it will do you no harm. I'm currently taking Jarrow Formulas 1000mcg methylfolate, and I've previously taken Solgar folate as metafolin. Both are good brands.