If serum cristanine remains between 1.2 to 1.8 is it harmful?

Harmful creatinine?: One's serum creatinine (c) is a function of one's age, sex, body weight and race. A c of 1.2 in an 83 year woman who weighs 90 lbs, is a sign of abnormal renal function (r), as she has a low muscle mass. To answer your question is to have a nephrologist do a 24 hour urine for creatinine clearance and protein, renal ultrasound done and get some blood work. These data give accurate idea of one's r.