Testing blood creatinine after meals is generally inaccurate and eating may affect the results. Under normal circumstances, adult male blood creatinine 53~106μmol/L, adult female blood creatinine 44~97μmol/L. Blood creatinine is mainly used to initially estimate the kidney function of the examinee and to determine the degree of progression of kidney disease. After a meal, the creatinine produced by the metabolism of the food eaten by the body may cause the value of blood creatinine to be higher than usual, which may affect the doctor’s judgment of the disease. Therefore, testing blood creatinine after a meal is generally inaccurate. It is recommended that patients do not eat after 10:00 p.m. on the day before the test and go to the hospital early the next morning on an empty stomach to have their blood drawn for the test. If the patient needs to improve the blood creatinine test, it is recommended to go to a regular hospital to have the test results prescribed and evaluated by a professional doctor.