A nurse is assessing a pregnant client at 28 weeks gestation in the outpatient clinic who presents with fever, abdominal tenderness, and foul-smelling amniotic fluid. Her membranes ruptured 18 hours ago. Which assessment finding would be most indicative of chorioamnionitis?

The cornerstone of clinical diagnosis is maternal fever, defined as a single temperature of ≥100.4°F (38.0°C) or two temperatures of 99.6°F (37.6°C) to 100.3°F (38.0°C) measured 30 minutes apart. This finding alone should trigger immediate evaluation for intra-amniotic infection in the setting of ruptured membranes.

• Maternal tachycardia (>100 bpm) reflecting systemic inflammatory response.
• Fetal tachycardia (>160 bpm) as an early fetal response to infection.
• Uterine fundal tenderness on palpation, distinct from normal labor discomfort.
• Purulent or foul-smelling amniotic fluid noted on speculum examination.
• Maternal leukocytosis (WBC >15,000 cells/mm³) in the absence of corticosteroid administration.

In a client with prolonged rupture of membranes (>18 hours), perform frequent vital sign monitoring every 2-4 hours. Assess for the triad of maternal fever, uterine tenderness, and foul-smelling discharge. Document fetal heart rate patterns, as fetal tachycardia often precedes maternal fever. Prompt recognition and reporting of these findings is critical to initiate intrapartum antibiotic therapy and expedite delivery to prevent maternal and neonatal sepsis.

Fever in labor may also arise from epidural anesthesia, dehydration, or extrauterine infections (e.g., UTI, respiratory infection). However, the combination of fever with ruptured membranes and uterine tenderness strongly favors chorioamnionitis over these alternative etiologies. Preeclampsia with severe features presents with hypertension and proteinuria, not fever. Placental abruption presents with vaginal bleeding and abdominal pain but typically lacks infectious signs.