815 internal monitored labors were compared with 610 non monitored labors in two groups monitored labor (group 1 without cesarean section, forceps, manual delivery, and group 2 with cesarean section, forceps or manual delivery); the incidence of post partum endometritis has been compared with the same group 1 and 2 of non monitored labor. In group 1 the rate of endometritis was higherr in monitored labors (15 endometritis among 468 cases; 3,2%) than in the non monitored labors (6 endometritis among 441 cases, 1,8%): the difference was in border line significance (p between 0,05 and 0,10). The rate of endometritis was also in group 2 higher (20 endometritis among 347 cases (5,2%) than in non monitored labor (3 endometritis among 169 cases (1,7%) (p < 0,05).