For clinical purposes, preterm and post-term infants are defined as:
a. Preterm before 34 weeks if appropriate for gestational age (AGA) and before 37 weeks if small for gestational age (SGA).
b. Post-term after 40 weeks if large for gestational age (LGA) and beyond 42 weeks if AGA.
c. Preterm before 37 weeks, and post-term beyond 42 weeks, no matter the size for gestational age at birth.
d. Preterm, SGA before 38 to 40 weeks, and post-term, LGA beyond 40 to 42 weeks.
ANS: C
Preterm and post-term are strictly measures of time—before 37 weeks and beyond 42 weeks, respectively—regardless of size for gestational age.
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