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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.
1. The best method for directly determining the GFR is a procedure called an inulin clearance.. It involves introducing a fluid containing the marker molecule inulin (NOT insulin) into your veins (IV â intravenous infusion) and then collecting timed urines over a period of hours. The urine volumes are noted and the inulin in each sample is measured to allow determination of the GFR.