The repetitive uterine contraction during childbirth which is associated with the progressive dilation of the uterine cervix (CERVIX UTERI). Successful labor results in the expulsion of the FETUS and PLACENTA. Obstetric labor can be spontaneous or induced (LABOR, INDUCED).
Obstetric Labor
D007747
Labor Stage, First
Period from the onset of true OBSTETRIC LABOR to the complete dilatation of the CERVIX UTERI.