Intermediate
Technical
In the Industry Vocabulary Test
effacement
Thinning and shortening of the cervix during labor, measured as a percentage.
Full Definition
Effacement refers to the progressive thinning and shortening of the cervix during late pregnancy and labor. This process occurs as the cervical tissue is drawn up into the lower uterine segment by uterine contractions. Effacement is measured as a percentage, with 0% indicating a thick, uneffaced cervix and 100% indicating complete effacement where the cervix has become paper-thin. This parameter, along with dilation and fetal station, is used to assess labor progress and is documented during cervical examinations.
Usage
Usage note: Always express as a percentage; distinguish from dilation which is measured in centimeters.
In Context
- "Cervical examination revealed 80% effacement and 4 cm dilation." — Labor progress note
- "The cervix showed minimal effacement at this stage of labor." — Delivery documentation
Also known as
cervical thinning
Contrasted with
cervical thickening
Don't confuse with
dilation
cervical length