Preterm labor vs Term labor
How to tell Preterm labor and Term labor apart when a board question makes them look alike.
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Gestational age threshold of 37 completed weeks with true labor cervical change.
Side by side
Regular contractions with cervical change before 37 weeks indicate preterm labor and trigger fetal-maturity and neuroprotection interventions.
Regular contractions with cervical change at or after 37 weeks indicate term labor and generally follow standard delivery management.
Early activation of labor pathways leads to premature cervical ripening and uterine contraction before full-term fetal maturation.
Physiologic labor onset at term progresses with coordinated contraction and cervical dilation when fetal maturity is expected.
Preterm labor is defined clinically before 37 weeks with cervical dilation and effacement change; fetal fibronectin and cervical length can aid risk assessment in uncertain cases.
Term labor occurs at 37 weeks or later with expected cervical progression and no prematurity-directed medication requirements in uncomplicated cases.
The trap
Using tocolytics indiscriminately at term adds risk without benefit. Conversely, missing preterm labor can forfeit antenatal corticosteroid benefit and neonatal outcomes.
The repair move
Next best step: confirm true preterm labor, give betamethasone 12 mg IM now and repeat in 24 hours, start tocolysis such as nifedipine when no contraindication exists to gain steroid time, provide GBS prophylaxis when indicated, and reserve magnesium sulfate for fetal neuroprotection if under 32 weeks and imminent delivery.
Try a free question
CoreA pregnant patient at 34 weeks has regular contractions and cervical dilation progression over 2 hours. What is the most likely diagnosis?
Show answer and explanation
Answer: B. Preterm labor. Regular contractions with cervical change before 37 weeks define preterm labor.
Why the other choices are tempting
- A. Incorrect because term labor begins at 37 weeks or later.
- C. Incorrect because Braxton Hicks contractions do not cause progressive cervical dilation.
- D. Incorrect because placenta accreta is a placental adherence disorder, not a labor-timing diagnosis.
- E. Incorrect because postterm refers to pregnancy beyond 42 weeks.
Flashcards
Tap a card to flip it.
What gestational-age cutoff separates preterm from term labor management pathways?
Before 37 weeks is preterm; 37 weeks or later is term.
What medication course is key in many preterm labor cases to improve fetal lung maturity?
Antenatal corticosteroids such as betamethasone 12 mg IM every 24 hours for 2 doses.
Quick answers
What is the fastest way to tell Preterm labor from Term labor?
Gestational age threshold of 37 completed weeks with true labor cervical change.
What is the key clue for Preterm labor?
Regular contractions with cervical change before 37 weeks indicate preterm labor and trigger fetal-maturity and neuroprotection interventions.
What is the key clue for Term labor?
Regular contractions with cervical change at or after 37 weeks indicate term labor and generally follow standard delivery management.
What is the common trap with Preterm labor vs Term labor?
Using tocolytics indiscriminately at term adds risk without benefit. Conversely, missing preterm labor can forfeit antenatal corticosteroid benefit and neonatal outcomes.