What is the appropriate course of action for a suspected false positive test of GFR 2?
If the GFR is near 60 mL/min/1.73 m2 and the patient does not have any risk factors for CKD and is otherwise well, the next step is to check for markers of kidney damage. This should include a urinalysis and measurement of albumin-to-creatinine ratio in a spot urine sample. If these are negative, then it is reasonable not to pursue other investigations at that time; however, it may be prudent to monitor estimated GFR more frequently, adjust the dosage of medications that are excreted by the kidney and avoid medications toxic to the kidney (see questions 26, 29, 31). If an accurate measurement is required, a clearance measurement can be performed (see questions 22, 34). Referral to a nephrologist may also be indicated for decisions regarding diagnosis or further evaluation (see question 47).
