Which time-based description of a stage of development in pregnancy is accurate?
a. Viability—22 to 37 weeks since the last menstrual period (LMP) (assuming a fetal weight >500 g)
b. Term—pregnancy from the beginning of week 38 of gestation to the end of week 42
c. Preterm—pregnancy from 20 to 28 weeks
d. Postdate—pregnancy that extends beyond 38 weeks
ANS: B
Term is 38 to 42 weeks of gestation. Viability is the ability of the fetus to live outside the uterus before coming to term, or 22 to 24 weeks since LMP. Preterm is 20 to 37 weeks of gestation. Postdate or postterm is a pregnancy that extends beyond 42 weeks or what is considered the limit of full term.
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