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Antepartum Assessment 5: Key Differences in Normal vs Abnormal by Gestational Age

Antepartum Assessment 5: Key Normal vs Abnormal by Gestational Age

This lecture provides a comprehensive review of the antepartum assessment using the same five categories as the intrapartum assessment, but with a critical twist: the interpretation of normal vs. abnormal findings is highly dependent on gestational age (especially before vs. after 20 weeks). Vital signs are monitored to track trends and identify underlying chronic or pregnancy-induced issues. Pain, contractions, leaking, bleeding, and fetal movement each have distinct expected presentations and red flags based on the trimester. Understanding the foundational Nursing 351 OB Terminology: Gravida, Para, Trimester & Abbreviations is essential before diving into these assessments.


Key Takeaways

  • 20-week cutoff is central: findings before 20 weeks often relate to chronic conditions or early pregnancy complications; after 20 weeks, they are often pregnancy-induced.
  • Never assume any complaint is 'normal' without considering gestational age, and always evaluate thoroughly.
  • Preterm labor, PROM, placental abnormalities, and decreased fetal movement are high-risk conditions that require immediate evaluation. For a deeper dive into labor mechanics, refer to Stages of Labor, Cervical Change & True vs False Labor Explained.

1. Vital Signs

  • Normal ranges remain the same as intrapartum (e.g., BP, fever >100.4°F).
  • Fluctuations from baseline are expected due to physiological changes (e.g., second trimester dip in BP) but should stay within normal limits.
  • Trend monitoring helps link abnormal findings to:
    • Before 20 weeks → chronic issues (pre-existing or newly diagnosed)
    • After 20 weeks → pregnancy-induced issues (e.g., preeclampsia) that typically resolve postpartum.

2. Pain

  • Always assess location, quality, severity (0–10 scale).
  • Gestational age determines significance:
    • Low back pain at 34 weeks → expected due to lordosis and weight. Comfort measures appropriate.
    • Low back pain at 10 weeks → concerning for uterine cramping, threatened abortion, or other pathology.

3. Contractions

  • First trimester: cramping is never normal – assess for miscarriage or ectopic.
  • Second/third trimester: differentiate Braxton Hicks from true preterm labor. The Intrapartum Nursing: Labor Stages, EFM Interpretation, and OB Emergencies guide provides further detail on distinguishing these contraction patterns.
    • Braxton Hicks: irregular, non‐painful, subside with position change/hydration.
    • True contractions: painful, rhythmic, increasing frequency/strength, persist despite rest. Rule out preterm labor.

4. Leaking of Fluid (Rupture of Membranes)

  • Never assumed normal unless at term (≥37 weeks) with expected labor onset.
  • Preterm (before 37 weeks): suspect PPROM (preterm premature rupture of membranes).
    • Pre‐viability (<23 weeks): limited lung development; risk of respiratory failure even if pregnancy continues.
    • Always evaluate for infection risk (prolonged ROM → chorioamnionitis).
    • Document: color, time of onset, duration.

5. Vaginal Bleeding

  • Never normal at any gestation – always requires evaluation.
  • Before 20 weeks common causes:
    • Implantation bleeding (very early)
    • Spontaneous abortion / threatened abortion
    • Subchorionic hemorrhage
    • Ectopic pregnancy (emergency)
    • Molar pregnancy
  • After 20 weeks common causes (the “three Ps”):
    • Placenta previa
    • Placental abruption
    • Vasa previa

For a comprehensive look at these high-risk placental complications, see Intrapartum Complications: Cord Prolapse, Shoulder Dystocia & Emergencies.


6. Fetal Movement

  • Before 20 weeks: lack of movement is not concerning – fetus is small and uterus low.
    • First movement (quickening) typically felt 16–20 weeks as flutter.
  • After 20 weeks: expected to feel daily movement; patients should know their baseline.
    • Anterior placenta may reduce perceived movement – educate patient.
    • Decreased/lack of movement is a red flag → instruct patient to:
      1. Drink cold water
      2. Lie on left side
      3. Perform kick counts (e.g., 4 movements in 1 hour, or 10 in 2 hours)
      4. If still low, come in for NST (nonstress test) and possibly BPP (biophysical profile).

For more on the EFM and NST interpretation used in such evaluations, refer to Intrapartum Assessment & EFM Interpretation: Focused Nursing Guide.


Overview and key differentiators of normal vs. abnormal antepartum findings per gestational age. }

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