Final answer:
The nurse's care plan at 34 weeks gestation should include administering terbutaline to manage preterm labor contractions due to the immature L/S ratio and absence of PG, which are indicative of undeveloped fetal lungs.
Step-by-step explanation:
The nursing plan of care should include administering terbutaline. The L/S ratio of 1.4:1 indicates immature lungs, and since phosphatidylglycerol (PG) is absent, the fetus's lungs may not be mature enough for adequate gas exchange. Terbutaline, a tocolytic medication, is used to halt preterm labor by relaxing the uterine muscles, thereby preventing contractions and potentially delaying birth to allow for further fetal lung development.
Given that the client is at 34 weeks of gestation and is experiencing uterine contractions, terbutaline can provide the necessary intervention to manage these contractions. Furthermore, as the client is ABO-Rh B-negative, Rho(D) immune globulin has likely been administered to prevent Rh sensitization.