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急性肾衰(ARF)主要分肾前性氮质血症(功能性)、尿路梗阻性及肾脏本身病变。一般非侵入性检查即可正确地区别这些分类。常用的尿液诊断指标—尿纳量、尿渗透压、尿-血浆肌酐比率——并不能鉴别肾衰的各种基本原因。Espinel等认为预先测定滤过纳的排泄分数(FENa)可作为鉴别肾前性氮质血症和急性肾小管坏死(ATN)的可靠指标定义:滤过纳排泄分数(FENa)为尿—血浆钠
Acute renal failure (ARF) is mainly divided into prerenal azotemia (functional), urinary tract obstruction and renal disease itself. General non-invasive examination can correctly distinguish these categories. Common diagnostic indicators of urine - urine volume, urine osmolality, urine - plasma creatinine ratio - and can not identify the various basic causes of renal failure. Espinel et al. (2005) found that pre-determination of FENa was defined as a reliable indicator of prerenal azotemia and acute tubular necrosis (ATN): FENa was urinary-to-plasma sodium