Partially Effaced Vertex: Labor Progress Indicator

In labor, partially effaced vertex describes two simultaneous findings:

• Effacement: Cervical thinning/shortening, measured 0–100% (0% = long/closed, 100% = paper-thin). "Partially effaced" = intermediate (e.g., 40–70%).
• Vertex: Fetal head (presenting part) engaged in the maternal pelvis.

Clinical Significance

Indicates active labor progression. Effacement usually precedes dilation; vertex engagement often occurs after ~50% effacement. Full effacement = "ripe" cervix.

Rates vary; discuss with your midwife or obstetrician.