My last blood test revealed an elevation in my creatinine level. What does this indicate?

Creatinine is a waste product in the blood that comes from muscle activity. Healthy kidneys remove creatinine from the blood. As kidney function slows down, creatinine level goes up. With a creatinine level, you can figure out a glomerular filtration rate (GFR) using the GFR calculator. GFR is the best measure of kidney function and it tells the stage of kidney disease. Talk with a doctor about GFR and what treatment is best for you.