Fetal position & pelvisFree in the app
Station & fifths palpable
How far the head has descended.
Source: Crichton · textbooksMeasure
| Fifths | Head felt above symphysis in fifths: 5/5 free → 0/5 deep in pelvis. |
|---|---|
| Engaged | ≤2/5 palpable (biparietal diameter through the brim). |
| Station | Leading bony point vs ischial spines: −3 to +3 cm (0 = at spines). |
Caput can make the head feel lower than it is — always check fifths abdominally. Instrumental birth needs ≤1/5 palpable.
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.