30th April 2024

A 32-year-old woman at 30 weeks’ gestation presents with intermittent abdominal pain and a feeling of pelvic pressure for the last 24 hours.

A 32-year-old woman at 30 weeks’ gestation presents with intermittent abdominal pain and a feeling of pelvic pressure for the last 24 hours. She reports no vaginal bleeding, discharge, or fluid leakage. Her previous obstetric history is unremarkable. On examination, her vital signs are stable, and uterine contractions are noted every 15 minutes.

Which is the most appropriate initial diagnostic investigation to assess for preterm labour?