Hello Doctor, My husband GFR dropped to 46 in one urine test on Feb 7, 2019 while he had UTI. Question 1: I wonder if UTI may give the false GFR reading? Question 2: To be considered CKD Stage 3, only when this low reading last for 3 months, right? His GFR had always been above 60 before Oct, 2018. He, however, had one kidney removed on Nov 6, 2018. I wonder if losing a kidney may be at risk to a CKD? Thanks so much.

The removal of one kidney will result in a decrease in the estimated glomerular filtration rate (eGFR). You are correct that in order to qualify as chronic kidney disease (CKD) the abnormal eGFR must be present for at least 3 months. Infection can be associated with a temporary reduction of the eGFR. I suggest continued monitoring of your husband’s kidney function.