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from Section 3 - Antepartum (Late Pregnancy)
Published online by Cambridge University Press: 08 April 2025
Post-dates or post-term pregnancy refers to a pregnancy that has reached or extended beyond 42 0/7 weeks’ gestation. The incidence of post-dates pregnancy in the United States was 5.5% in 2011 and is decreased by accurate gestational age determination and membrane sweeping. Risk factors for post-dates pregnancy include a prior post-dates pregnancy, nulliparity, maternal obesity, carrying a male fetus, and certain fetal disorders. Post-dates pregnancy is associated with increased fetal, neonatal, and maternal risks. Therefore, women without a complicated pregnancy or contraindications to vaginal delivery should be recommended for labor induction between 42 0/7 and 42 6/7 weeks’ gestation. For these women, antenatal fetal surveillance at or beyond 41 0/7 weeks of gestation may be indicated given the increased risk of stillbirth at or beyond this gestational age. Labor induction can also be considered after 41 0/7 weeks’ gestation.
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