Usually cystatin C 0.02mg/L higher than normal is not too serious. It is usually seen in conditions such as staying up late at night, taking a lot of glucocorticoids, or early kidney injury caused by diabetic nephropathy, hypertensive nephropathy, acute and chronic renal failure, IgA nephropathy, lupus nephritis, acute and chronic glomerulonephritis and other diseases. Cystatin C is an indicator of glomerular filtration rate, which is very sensitive and can reflect kidney damage earlier than blood creatinine and urea nitrogen. It is mainly excreted by the kidneys and is not affected by factors such as mood, diet, gender and age. High cystatin C is usually seen in cases of staying up late at night, taking a lot of glucocorticoids, or early kidney damage caused by diabetic nephropathy, hypertensive nephropathy, acute and chronic renal failure, IgA nephropathy, lupus nephritis, acute and chronic glomerulonephritis, and other diseases. Since cystatin C is not too much higher than normal, most of them are less serious. However, it should be taken seriously. If you find cystatin C is higher than normal, it is recommended to go to the hospital in time to find out the cause and follow the doctor’s instructions for standardized diagnosis and treatment.