Hey, does anybody have any suggestions on improving kidney function? I've had a kidney removed nearly 20 years ago (car wreck) and for a while my remaining kidney had been pretty stable.

Lately, my remaining kidney's function has been progressively deteriorating. I take Norvasc and a beta blocker to treat high blood pressure and I drink a lot of water every day, but my eGFR doesn't show any improvement. Anybody got any ideas? And does anybody know how I should expect this to play out and relative timeframes?

Here is a recent history of some of my eGFR (non-African) tests I've had done by Quest:

38 mL/min/1.73m2 (Low)
Date: May 13, 2021 Reference Range:> OR = 60

46 mL/min/1.73m2 (Low)
Date: Apr 12, 2021 Reference Range:> OR = 60

42 mL/min/1.73m2 (Low)
Date: Mar 16, 2021 Reference Range:> OR = 60

49 mL/min/1.73m2 (Low)
Date: Dec 15, 2020 Reference Range:> OR = 60

58 mL/min/1.73m2 (Low)
Date: Jul 17, 2020 Reference Range:> OR = 60

61 mL/min/1.73m2
Date: Nov 01, 2019 Reference Range:> OR = 60