{"id":"mthfr-a1298c","name":"MTHFR A1298C","shortName":"MTHFR A1298C","aliases":["MTHFR 1298","MTHFR Gene A1298C","rs1801131","MTHFR 1298A>C","A1298C","MTHFR c.1286A>C","MTHFR (A1298C)","Methylenetetrahydrofolate Reductase A1298C"],"abbreviations":["A1298C","1298A>C"],"loinc":[{"code":"28060-2","primary":true},{"code":"94414-0","primary":false},{"code":"21709-1","primary":false}],"specimen":"whole-blood","units":[],"referenceRanges":[],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A gene test for a common MTHFR variant that appears milder than C677T. Medical groups advise against routine testing for clots, and most people with it are healthy.","url":"https://bloodtesttracker.com/markers/mthfr-a1298c","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}