能在手術前正確評估阻塞性腎臟病人患側腎臟功能，對泌尿科醫師決定治療方式是非常重要的。我們分析了60位單側腎水腫病人的腎臟超音波腎皮質厚度和碘131同位素測定有效腎臟血漿流量之相關性，結果顯示腎皮質厚度合和在水腫側腎臟為43.3±23.6公厘，在非水腫側腎臟為69.3±12.4公厘；每分鐘有效腎臟血漿流量在水腫側腎臟為107.0±81.8毫升，在水腫側腎臟為248.8±105.2毫升。經過線性廻歸統計分析後，分別在水腫側腎臟及非水腫側腎臟兩組數據中都水又觀察到相關性。因此，腎臟超音波只能提供我們解剖上的訊息，目前並無法用來準確評估腎功能。

Purpose: Renalfunction assessed by conventional renal ultrasonography in patients with obstructive uropathy was evaluated to provide a valuable parameter for decision-making pre-operatively. Materials and Methods: Results from patients with unilateral obstructive uropathy who received both Iodine-131 orthoiodohippurate (OIH) comprehensive renal function test and conventional sonography of kidney were analyzed retrospectively. The correlation between effective renal plasma flow (ERPF) and sum of the thickness of upper, middle, and lower portion in obstructed renal units (Group I) and non-obstructed (Group II) renal units were analyzed with linear regression method. Results: A total of 60 patients (120 renal units) were analyzed. In Group I kidneys, the sum of the renal cortical thickness was 43.4±20.6 mm and ERPF was 107.0±81.8 ml/min. In Group II, the sum of the renal cortical thickness was 69.3±12.4 mm and the ERPF was 248.8±1 05.2 ml/mm. There was no correlation between ERPF and the sonographic-estimated thickness between obstructive (r2= 0.404) and non-obstructive (r2 = 0.054) kidneys Conclusion: Sonography provides non-invasive and convenient anatomical information about the obstructed kidneys, but renal function still cannot be estimated by this modality.