A creatinine test is used to see if your kidneys are working normally. To be specific, it measures the level of creatinine in your bloodstream. Creatinine is a chemical waste produced in your body. Healthy kidneys filter creatinine from your body. If your kidneys aren’t functioning properly, an increased level of creatinine accumulates in your blood.
Doctors prescribe a creatinine test if you have Type 1 or Type 2 diabetes, have kidney diseases or if you have an illness that may affect your kidneys.