51 yo male. mild chf, ef of 50. kidney failure caused by meds. creatinine returned to 1.6 after meds stopped. are my kidneys severely damaged?

Not severely: 1.6 is a long way from dialysis, but you do have a moderate amount of damage. What to expect would depend on your med. Are you sure you don't have diabetes?

Some damage: Stage 3 of chronic renal failure consists of egfr 45-59 (3a) or 30-44 (3b).Rememember that egfr is an estimate (more info on egfr) and may require a correction for (black) race. Most patients with stage 3ckd are older and only a minority go on to get more serious kidney disease.Increased rate of heart attacks, strokes. Need to be closely followed by physician.Stage4, 5 are more severe renal failure.