Extrapelvic measurement

Extrapelvic measurements are performed to assess the size and shape of the pelvis and determine whether the fetus can be delivered vaginally. It is used to evaluate the size and shape of the pelvis and determine whether the fetus can be delivered vaginally. If there is no pelvic measuring device, the examiner's fist can be placed between the two ischial tuberosities. When a punch can be accommodated, it is estimated that the diameter is greater than 8.5cm, which is normal. By measuring this diameter line, you can directly understand the length of the pelvic outlet transverse diameter. When the transverse diameter of the outlet is less than 8cm, the posterior sagittal diameter should be measured.