Which statement accurately describes dilation and effacement in labor?

Which statement accurately describes dilation and effacement in labor?

• A. Dilation refers to opening from 0 to 10 cm; Effacement refers to thinning
• B. Dilation refers to thinning; Effacement refers to opening from 0 to 10 cm
• C. Dilation and effacement are unrelated
• D. Dilation occurs after effacement in all cases

Answer: (A)

Dilation is about how far the cervix has opened during labor, measured in centimeters from 0 cm (closed) to 10 cm (fully dilated). Effacement describes how thin and shortened the cervix becomes, usually expressed as a percentage from 0% (no thinning) to 100% (completely thinned). These two processes progress as labor progresses, but they don’t have to occur in a fixed order—one can efface before dilating, or dilate before full effacement. The statement that dilation refers to opening from 0 to 10 cm and effacement refers to thinning accurately captures each concept.

Dilation is about how far the cervix has opened during labor, measured in centimeters from 0 cm (closed) to 10 cm (fully dilated). Effacement describes how thin and shortened the cervix becomes, usually expressed as a percentage from 0% (no thinning) to 100% (completely thinned). These two processes progress as labor progresses, but they don’t have to occur in a fixed order—one can efface before dilating, or dilate before full effacement. The statement that dilation refers to opening from 0 to 10 cm and effacement refers to thinning accurately captures each concept.