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The methylenetetrahydrofolate reductase (MTHFR) mutation test is used to detect two relatively common mutations in the MTHFR gene that are associated with elevated levels of homocysteine in the blood. It is not routinely ordered.
The urine test checks for a protein called albumin, which isnât routinely detected when your kidneys are healthy. The blood test checks your GFRâglomerular filtration rate. GFR is an estimate of your kidneyâs filtering ability. A GFR below 60 is a sign of chronic kidney disease.