eGFR off, High renin...

Since last November, my eGFR has been noted as being <59 (no real number). I have had my adrenals removed in 2006 due to Cushing's disease - pituitary surgery did not work so the adrenals did not work. During an ultrasound afterward, prior to a hysterectomy, it was noted that one kidney has dropped.

My renin is always high. My blood pressure however, is always low - I take florinef and salt to try to keep a normal blood pressure but my renin levels have been as high at 18 and somewhere around 8-9, with normal being around 1. My aldosterone levels are low - that is probably due to the removal of the adrenals.

In the past, I have had PTH issues, low PTH, high urinary calcium, and diagnosed hypoparathyroid. Creatinine levels were high when I had Cushing's - seems ok now. I get it tested in the urine when I do 24 hour tests.

My AST/ALT are fine.

I did the calculation on the website noted on the lab reports. It said I probably do have CKD - but I just find it strange given most of my tests are in normal ranges. None of my docs picked up on the eGFR...

Is it worth seeing a nephrologist?