Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.
postterm pregnancyPost-datism Obstetrics A gestation correctly dated by Naegele's rule and ≥ 42 wks in duration; post-mature infants have ↑ M&M:
1. they are bigger and.
2. the placenta has 'planned obsolescence', and undergoes fibrosis and infarction after 40-42 wks Clinical Absent lanugo, attenuated vernix caseosa, long finger- and toenails, abundant scalp hair, pale, parchment-like or desquamating skin and ↑ alertness. Cf Prematurity.
Extension of the duration of pregnancy beyond the beginning of the 42nd week (294 days) of gestation, as counted from the first day of the last normal menstrual period. This occurs in an estimated 3% to 12% of pregnancies. Complications include oligohydramnios, passage of meconium, macrosomatia, and dysmaturity, all of which may lead to poor pregnancy outcome, including perinatal death.See: postmaturity syndrome
See also: pregnancy