A nurse is caring for a client who is in preterm labor with a current LUS ratio of 1:1. Which of the following actions should the nurse take?

Choice A rationaleHydralazine is an antihypertensive medication used to manage hypertension, not preterm labor. Administering hydralazine would be inappropriate for a client in preterm labor unless she also has hypertension.Choice B rationalePreparing the client for immediate delivery based solely on a lecithin-to-sphingomyelin (L/S) ratio of 1: is premature. An L/S ratio of 2: or greater is generally indicative of fetal lung maturity. A ratio of 1: suggests lung immaturity, and interventions to promote lung maturity are indicated.Choice C rationaleInfusing a bolus of IV fluids might be considered for hydration in preterm labor, but it does not directly address the issue of fetal lung immaturity indicated by the low L/S ratio. While hydration can help manage preterm contractions in some cases, it is not the primary intervention to improve fetal lung maturity.Choice D rationaleAdministering betamethasone, a corticosteroid, is the appropriate action for a client in preterm labor with a low L/S ratio (1:). Betamethasone crosses the placenta and stimulates the production of surfactant in the fetal lungs, accelerating lung maturity and reducing the risk of respiratory distress syndrome in the preterm infant. The typical dose is 12 mg IM, given in two doses 24 hours apart. .