The Determination of 22 cases in normal children by radioimmunoassay (RIA), the content of blood plasma endothelin (84.13±26.16pg/ml)
±s, 15 cases with acute glomerulonephritis (77.63±34.11pg/ml), 10 cases with simple nephrosis (140.03±51.80pg/ml), 11 cases with chronic glomerulonephritis in adult (223.32±68.09pg/ml). 26 cases in the gronp of normal adult, the content of blood plasma endothelin (88.43±26.27pg/ml), the comparison between the gronps of normal children and normal adult P>0.05.