The levels of tumor necrosis factor a ( TNF α) and phospholipase A 2 ( PLA 2) in peripheral blood were determined by means of the ELISA and improved micromethod in 31 patients with urmia and 12 normal healthy persons. 采用酶联免疫法和改进微量滴定法测定31例尿毒症患者和12例正常人外周血肿瘤坏死因子(TNFα)和磷脂酶A2(PLA2)水平。