Routine blood tests do not include blood creatinine. The usual blood tests include red blood cells, platelets, erythrocyte pressure volume, mean platelet volume, platelet volume distribution width, white blood cells, mean hemoglobin volume of red blood cells, and hemoglobin. Blood creatinine is the metabolic end product of creatine in muscle tissue. When the renal parenchyma is damaged, the glomerular filtration rate decreases and the blood creatinine concentration increases, so the blood creatinine concentration can be used as an indicator of impaired glomerular filtration rate. Blood creatinine value is mainly obtained through blood biochemical examination, which is a renal function test. If patients need to undergo renal function tests, it is recommended to go to a regular hospital and have the test results prescribed and evaluated by a professional doctor.