MTHFR Testing - Best Lab to use?

My LLMD ran the MTHFR test via labcorp, it came back negative.

Per the results, it looks like they are only testing for 2 variations. Is it possible to have a mutation that is not captured by LabCorp testing? Should I seek further testing? Best lab suggestion? I see 23andMe all over this forum - seems like it might be the best next step.

Here is the text from Labcorp results:

Result: NEGATIVE (No mutation identified)
Interpretation:
The MTHFR C677T and A1298C variants were not identified. While the
individual does not possess either of these factors, other risk
factors may be detected through systematic clinical laboratory
analysis. Hyperhomocysteinemia may occur due to mutations in enzymes
other than MTHFR that are involved in homocysteine metabolism, or
arise due to acquired factors such as folate, vitamin B6 or vitamin
B12 deficiency. Therefore, this individual's MTHFR result does not
guarantee a normal homocysteine level. In the evaluation of vascular
and obstetric risk, consider measuring fasting homocysteine.

Many people dont have the ever popular MTHFR, but have others, sometimes many others.

23andme provides the data, and you link that to a site of your choice that decipers the data into lists of mutations you have, patiall have, or dont have. The one I used had 37 pages of possible mutations listed (about 25 per page, a lot!).

I dont remember the name at the moment, I can look later, something like sterlings app on mthfs support site.

i used Quest and it was fine. funny my LLMD ordered it but didn't put much stock in it. i'm sure he has his reasons. he did give me MTHF and DHEA as new supplements so he's doing something off it.