Preterm labor is defined as?

Appeared in: NHM MP Staff Nurse-2019

Explanation

Preterm labor is broadly defined as labor that occurs after 20 weeks but before 37 completed weeks of gestation.
The option 'Between 28-37 weeks' represents the period of 'very preterm' and 'moderate to late preterm' births.
While not the complete range, this option is the best and most clinically relevant description of viable preterm labor among the choices provided.
Historically, 28 weeks was often used as the lower limit based on the threshold of viability, making this a common classification in many textbooks.

Option A: This range describes extremely preterm or periviable births, which is only a small, high-risk subset of the entire preterm period, not the general definition.
Option C: This gestational period (37 to <40 weeks) is classified as 'Term' (Early Term and Full Term), not preterm. Labor during this time is considered normal.
Option D: This option is incorrect because Option B provides a valid and widely recognized classification of the preterm period, even if it's not the all-encompassing definition.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition and classification of preterm labor based on gestational age as background academic context rather than a clinical decision trigger.
Preterm birth is a leading cause of neonatal morbidity and mortality. Nurses play a vital role in identifying at-risk mothers, monitoring for signs of preterm labor, and managing care.
Nursing interventions for suspected preterm labor include monitoring uterine contractions and cervical changes, administering tocolytic medications to stop or slow labor, and giving antenatal corticosteroids (like betamethasone) to enhance fetal lung maturity.
What if? If a patient presents with regular contractions at 38 weeks gestation, the nursing priority shifts from stopping labor to preparing for a safe term delivery, as the fetus is no longer considered preterm.

How to Approach the Question

First, identify the core concept of the question, which is the definition of 'preterm labor'.
Recall the standard medical definition of preterm, which is based on gestational weeks. The key cutoff is 37 completed weeks.
Evaluate each option against this standard definition.
Option A (<24 weeks) is too early and represents periviability.
Option C (>37 weeks) is 'term', the opposite of preterm.
Option B (28-37 weeks) falls entirely within the preterm period. Even if the modern definition starts earlier (at 20-24 weeks), this is the only plausible range offered.

Concept Tested & Keywords

Concept Tested: Definition and classification of preterm labor based on gestational age.
Stem keywords: Preterm labor, defined as
Lead-in keywords: is defined as

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E6 Anatomy Grays 43e Vol 1 Part 3 p. 12-14

E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 30-32

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