It just so happens that I had blood tests a couple of weeks ago for my primary care doctor, and the tests included eGFR. I just checked with Google, and it says CKD-EPI is the equation that produces eGFR. So I think we are talking about the same thing. I have been taking prednisone for a year, and Actemra for more than 10 months (weekly injections). My eGFR was 92 in the tests 2 weeks ago. It has consistently ranged from 89 to 100 over the past year, and that included several months where I was at high doses of prednisone - 40 - 60 mg per day. Google says the normal range for a 73 year old man is 60 - 90, so you are still well within the normal range. Google also says the best ways to take care of your kidneys are to make sure your blood pressure is ok, your blood sugar is controlled, you eat a healthy diet, exercise, stay hydrated, etc.