Creatinine is divided into blood creatinine and urine creatinine, the reference standard will be different in different hospitals, creatinine 103 kidney function is generally normal. The normal value of blood creatinine for adult male is 53-106 μmol/L; the normal value of blood creatinine for adult female is 70.7-106.1 μmol/L; the normal value of blood creatinine for pediatric patients is 26.5-62.0 μmol/L. Usually, serum creatinine indexes in the range of 44-133 umol/L are considered to be normal, and renal function is not usually affected. The normal value of adult urinary creatinine is 40-130mg/dl; the normal value of children’s urinary creatinine is 71-195μmol/24 hours urine; the normal value of infants’ urinary creatinine is 88-177μmol/24 hours urine. The test results of blood creatinine and urine creatinine are affected by the test reagents, and the reference standards may vary in different hospitals, so it is recommended that patients consult the hospitals they visit and their specialized physicians.