Elevated cystatin C suggests a decrease in glomerular filtration function; low uric acid is common in malnutrition, renal tubular acidosis, etc. Low uric acid and high cystatin are not normal, and need to be combined with the rest of the laboratory indicators, such as creatinine, urea nitrogen, etc. to make a comprehensive judgment. The reference range of adult serum cystatin C is 0.6~2.5mg/L. Cystatin C in circulating blood is almost cleared by glomerular filtration, and as a marker of glomerular filtration rate, the sensitivity and specificity of cystatin C are better than serum creatinine. Elevated cystatin C suggests a decrease in glomerular filtration function, which can be used to evaluate the early damage of renal filtration function in diabetic nephropathy, especially the response to mild renal injury is more sensitive; uric acid is the end product of purine metabolism, and the occurrence of uric acid with low cystatin C needs to be further perfected with relevant examinations such as liver function and renal function. Laboratory test results need to be interpreted by a professional physician, it is recommended that the patient to the relevant departments of the regular hospital to further improve the relevant examinations, under the guidance of a professional physician treatment.