A waste product released from muscle tissue and excreted by the kidneys. The creatinine test is frequently used to assess kidney function. Elevated levels of serum creatinine may indicate kidney disease.
Estimated glomerular filtration rate or eGFR
is a test that tells how well your kidneys are filtering. Your health care provider may also do an urine test to check your kidneys. A eGFR of 60 or higher
(>60) is in the normal range, below 60 (<60) may mean kidney disease, and 15 or lower may mean kidney failure.