Classification of instrumental delivery

Classification of instrumental delivery table.
OutletFetal scalp visible without separating the labia

Fetal head is at or on the perineum

Sagittal suture is in the anterior-posterior diameter or right or left occiput anterior or posterior position (rotation does not exceed 45º)

LowLeading point of the skull (not caput) is at station plus 2 cm or more

Two subdivisions:

  • rotation of 45º or less from the occipito–anterior position
  • rotation of more than 45º including the occipito–posterior position
MidFetal head is no more than a fifth palpable per abdomen

Leading point of the skull is above station plus 2 cm but not above the ischial spines

Two subdivisions:

  • rotation of 45º or less from the occipito–anterior position
  • rotation of more than 45º including the occipito–posterior position