Diagnosis of<unk>  may be made when there is failure to progress, but not all cases of prolonged labour are the result of<unk> . Use of ultrasound to measure the size of the fetus in the womb is controversial, as these methods are often inaccurate and may lead to unnecessary caesarian section; a trial of labour is often recommended even if size of the fetus is estimated to be large. Theoretically, pelvimetry may identify<unk> . However, a woman's pelvis loosens up before birth (with the help of hormones). A Cochrane review in 2017 found that there was too little evidence to show whether pelvimetry is beneficial and safe when the baby is in cephalic presentation. A review in 2003 came to the conclusion that pelvimetry does not change the management of pregnant women, and recommended that all women should be allowed a trial of labor regardless of pelvimetry results. It considered routine performance of pelvimetry to be a waste of time, a potential liability, and an unnecessary discomfort.
Cephalopelvic disproportion
Persistent fetal circulation
Fetal distress
Retained placenta
Shoulder dystocia
Placental insufficiency
Prolonged labor
Umbilical cord prolapse