Creatinine 140μmol/L may be physiological elevation, normal phenomenon, not belong to kidney disease; it may also be pathologically elevated, such as acute and chronic renal failure, for chronic renal failure, creatinine clearance can be calculated by gender, age, body weight, etc., which probably belongs to belong to the stage 1~2 of chronic kidney disease. If staged by blood creatinine, it belongs to belong to chronic renal failure stage 1. Physiological elevation, such as caused by strenuous activities, eating a lot of meat, etc., is generally a normal phenomenon, which does not belong to kidney disease and does not need to be staged, and it is recommended to take a light diet, pay attention to rest, and have regular rechecks. According to the glomerular filtration rate for chronic kidney disease staging, glomerular filtration rate greater than 90ml/min is stage 1, 60~89ml/min is stage 2, 30~59ml/min is stage 3, 15~29ml/min is stage 4, less than 15ml/min is stage 5. Creatinine 140μmol/L, combined with age, weight and so on, to calculate creatinine clearance, probably belongs to stage 1~2 of chronic kidney disease. If you find elevated creatinine, it is recommended to go to regular hospitals in time to find out the cause and follow the doctor’s instructions for standardized treatment.