Fetal position & pelvisFree in the app
Pelvis types (Caldwell–Moloy)
Shape predicts the mechanism of labour.
Source: Caldwell–MoloyType
| Gynaecoid ~50% | Round inlet, wide arch — most favourable. |
|---|---|
| Anthropoid ~25% | AP > transverse — OP and face-to-pubes birth. |
| Android ~20% | Heart-shaped, prominent spines, narrow arch — OP, deep transverse arrest, CPD. |
| Platypelloid ~5% | Flat — head engages transverse, arrest at inlet. |
A summary for trained clinicians. Always check the full guideline, the patient in front of you and your hospital's protocol. Spotted an error? Tell us.