A 28-week primigravida presents with vaginal fluid leakage for 2 days. Obstetric ultrasound confirms oligohydramnios (AFI 3.2 cm). The diagnostic workup marked D in the diagram includes assessment for PROM, placental insufficiency, and fetal renal anomalies. Which of the following is the MOST appropriate initial diagnostic step to confirm suspected PROM in this patient?

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