A nurse is admitting a client who is at 39 weeks of gestation and who states, "My water broke on the way to the hospital.”. Which of the following actions should the nurse take first?

Choice A rationale Asking about the fluid's color (clear, meconium-stained, bloody) provides information about fetal well-being and potential complications (like meconium aspiration), but it is a secondary assessment. While important, it does not supersede the need to immediately assess the most urgent physiological parameter of fetal status, which is the heart rate. Choice B rationale The rupture of membranes (water breaking) carries a risk of prolapsed umbilical cord, which can severely compromise fetal oxygenation by compressing the umbilical vessels. Determining the fetal heart rate (FHR) immediately is the priority action to identify signs of fetal distress, such as bradycardia (FHR <110 beats/min), indicating cord compression. The normal FHR range is 110-160 beats/min. Choice C rationale Monitoring cervical dilation is necessary to determine the stage and progress of labor. However, in the setting of ruptured membranes, assessing the immediate safety and stability of the fetus takes precedence over checking labor progress. A vaginal exam to check dilation is done after assessing FHR and ruling out immediate emergencies like cord prolapse. Choice D rationale Determining the vaginal pH with Nitrazine paper can confirm if the fluid is amniotic fluid (alkaline, pH 7.0-7.5) or urine/vaginal secretions (acidic). While this confirms the rupture of membranes, establishing the status of the fetus by assessing the FHR is the most critical and life-saving priority action to take first to prevent or quickly address fetal hypoxia.