A cystatin C value of 1.57 mg/L is within the normal range and is generally not serious. Cystatin C is an endogenous marker reflecting changes in glomerular filtration rate, with concentrations in serum and plasma ranging from 0.6 to 2.5 mg/L. Cystatin C is usually unaffected by age, body weight, gender, inflammation, etc., and therefore reflects the state of renal function at an earlier stage, and is often used as an indicator for detecting early renal impairment. An elevated value of cystatin C indicates a decrease in glomerular filtration rate, which may indicate mild kidney damage, possibly due to stones, tumors, etc. Symptoms such as bleeding and urinary retention may occur. A cystatin C value of 1.57mg/L is within the normal range and is not a cause for concern. It is recommended that patients with other symptoms go to the hospital in a timely manner, and follow the doctor’s instructions to improve the relevant examinations to avoid delaying the condition.