[Intraobserver and interobserver variation in measurement of the pelvic diameter using DeLee's internal pelvimeter in Cesarean section].

: The method of measuring the true conjugata with DeLee's Internal Pelviometer at caesarean section was evaluated. In 58 women the true conjugata were blindly measured three times by the surgeon and also, in fifty cases, three times by the assistant. Only a slight intraobserver difference was found: median range was 0.42 cm. There was no significant interobserver variation. We conclude that DeLee's Internal Pelviometer can be used to measure the true conjugata at caesarean section, but the use of pelviometry in modern obstetrics is questioned.