Methods The ET1 activities in the serum and BALF from 10 patients with sarcoidosis, 7 with idiopathic pulmonary fibrosis (IPF) and 8 normal subjects nonsmokers were determined using the radioimmunoassay.

• 方法利用同位素放射免疫直接测定法，检测10例肺结节病和8例特发性肺纤维化（IPF）患者外周血和支气管肺泡灌洗液（BALF）中内皮素1（ET?1）的活性，并与8名健康非吸烟者进行对照。