What do systematic reviews say?

Cervical dilatation vs no dilatation

Cervical dilatation showed no clear difference in drop from baseline haemoglobin > 0.5 g/dL compared with no dilatation (low certainty).

• Mechanical dilatation of the cervix during elective caesarean section before the onset of labour for reducing… 2018 · Cochrane Headline outcomes only
  RR 0.92 [0.64, 1.31]
  2 studies · 722 participants
  Low