To determine kidney function, we need to look at the indicators of biochemical test, urine test and imaging test.
1. Biochemical indexes: According to the test results of urea nitrogen, blood creatinine, uric acid and cystatin C, especially the blood creatinine and cystatin C test. In addition, the glomerular filtration rate can be calculated by combining age, gender and weight to judge the glomerular filtration function.
2. Urine examination: The function of renal tubules can be determined through urine examination, for example, urine osmolality and urine specific gravity can be examined after 12 hours of water fasting. Increased urinary retinol-binding protein, increased urinary β2-microglobulin, and even elevated renal glucose often suggests proximal tubular reabsorption dysfunction.
3. Imaging examination: when there is unilateral renal atrophy, bilateral renal ECT can be performed to observe the glomerular filtration rate of the left and right kidneys. According to bilateral ECT, renal function can be judged. When the renal volume is significantly reduced, the renal parenchyma echogenicity is enhanced and the cortex is thinned, which often suggests chronic renal damage.
Interpretation of renal function test results must be analyzed and judged by professional clinicians in combination with history, symptoms, signs and other auxiliary test results. If abnormalities are found, timely symptomatic treatment.