Normal blood creatinine levels are 0.6-1.2 mg/dL in men and 0.5-1.1 mg/dL in women. The amount of creatinine in the body is determined through a urine test. If the level of creatinine in the urine is lower than normal or higher than normal, kidney function is disturbed. Based on its quantity, it is determined whether the kidney is healthy or diseased. Therefore, creatinine level is called a diagnostic indicator of kidney disease.