The index of kidney function in normal people is mainly the creatinine in the blood, and the level of creatinine in the blood is different between men and women. The standard value of men is 53-106μmol/L, and the standard value of women is 44.2-88.4μmol/L. Blood creatinine is produced from protein metabolism. A decrease in the intake of exogenous protein, such as in people who cannot eat or some women who reduce intake for weight loss or weight loss, can reduce blood creatinine. A decrease in endogenous protein comes mainly from those with weak constitution or low muscle mass, especially women, who have a low muscle percentage and a low intake of exogenous protein, so it is easy to find a decrease in blood protein and blood creatinine, but it is mainly dominated by a decrease in creatinine.

The standard value of serum creatinine may vary due to the different test strips and detection methods used by different hospitals. Generally, the standard value fluctuates between 44-133umol/L, and the standard values of men and women are also different. Creatinine cannot completely and immediately reflect kidney function, as serum creatinine will only increase when the filtration rate of the renal tubules decreases to about 1/3, so the index is not very sensitive.

In addition to detecting creatinine to reflect kidney function, it is also necessary to check the creatinine clearance rate of the patient internally, and integrate with serum creatinine to reflect the patient’s kidney function. An increase in serum creatinine is generally common in patients with kidney insufficiency, including acute kidney failure and chronic kidney failure.

Creatinine is a substance in the body’s metabolism of muscle, mainly excreted after filtration by the renal tubules, so according to the location of creatinine in the body, it can be divided into blood creatinine and urine creatinine. The blood creatinine measured in clinical medicine is one of the common methods to master kidney function. The standard value of blood creatinine in men is 54-106μmol/L, the standard value of blood creatinine in women is 44-84μmol/L, and the standard value of blood creatinine in children is 24.9-69.7μmol/L. The measured value of blood creatinine will have some differences, as follows:

1. Generally, men have 20μmol/L more than women;

2. Compared with the test method, the enzymatic method is 20μmol/L lower than the colorimetric method;

3. If the blood creatinine is normal, the measured value should be 20μmol/L lower than the limit.