A woman at 36-weeks gestation who is Rh negative is admitted to labor and delivery reporting abdominal cramping. She is placed on strict bedrest and the fetal heart rate and contraction pattern are monitored with an external fetal monitor Two hours after admission, the nurse notes a large amount of bright red vaginal bleeding. Which nursing intervention has the highest priority?

A. Administer oxygen via facemask: Oxygen administration is generally a step in managing fetal distress. However, when dealing with variable decelerations, the initial action involves repositioning the mother to alleviate potential cord compression, as variable decelerations are often due to compression of the umbilical cord.

B. Turn off the oxytocin infusion: If variable decelerations persist despite repositioning, it might be necessary to discontinue the oxytocin (Pitocin) infusion temporarily. Oxytocin can cause or exacerbate uterine hyperstimulation, which can contribute to fetal distress.

C. Assess cervical dilatation: Assessing cervical dilatation might be a part of the overall assessment but might not directly address the immediate issue of variable decelerations. However, it's essential to monitor the progress of labor as part of the broader assessment.

D. Change the client's position: This is the recommended first action for variable decelerations. Repositioning the mother, such as moving her to a lateral or knee-chest position, can relieve potential cord compression and improve fetal oxygenation.

A. Obtain a drug screen for cocaine: Given the symptoms described (tremulous, tachycardic, hypertensive), there may be concern about drug exposure, and cocaine is a substance known to cause such symptoms in newborns. Therefore, obtaining a drug screen for cocaine is a reasonable and important action to determine if there was prenatal exposure.

B. Weigh and measure the newborn: While weighing and measuring the newborn is a routine part of the newborn assessment, it may not be the most crucial action in this context. The symptoms described suggest the need for a more immediate assessment related to possible drug exposure.

C. Determine reactivity of neonatal reflexes: Assessing the reactivity of neonatal reflexes is an important part of the newborn assessment, but in this specific situation, the symptoms described (tremulous, tachycardic, hypertensive) may warrant a more focused and immediate assessment related to drug exposure.

D. Perform gestational age assessment: Gestational age assessment is essential for understanding the newborn's maturity and adjusting care accordingly. However, in this scenario, the immediate concern seems to be the symptoms the newborn is presenting with, and addressing the possibility of drug exposure takes precedence.