The nurse is assessing a newborn who was precipitously delivered at 38-weeks gestation The newborn is tremulous, tachycardic, and hypertensive. Which assessment action is most important for the nurse to implement?

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.

A. Describe genetic testing protocols: While genetic testing may be part of prenatal care, it's not the primary concern for a pregnant woman addicted to heroin. The focus should be on managing the addiction and promoting a healthy pregnancy.

B. Discontinue the methadone right away: Abruptly stopping methadone, or any opioid replacement therapy, can lead to withdrawal symptoms, which can be harmful to both the mother and the fetus. It's crucial for pregnant individuals on methadone to work closely with their healthcare provider to manage the transition.

C. Sign up for group therapy sessions: Group therapy can be a supportive intervention for individuals dealing with addiction, but it should be part of a comprehensive treatment plan that includes medical management.

D. Start a prenatal care plan as soon as possible: This is the most appropriate choice. Prenatal care is crucial for monitoring the health of both the mother and the baby. Starting early allows healthcare providers to address any potential issues and provide necessary support. This includes managing the mother's opioid addiction through medications like methadone, which can be administered under close medical supervision during pregnancy.