Final answer:
The priority action for a client receiving Oxytocin is to evaluate the client's uterine contractions.
Step-by-step explanation:
The priority action for a client receiving Oxytocin is to evaluate the client's uterine contractions. Oxytocin is a hormone that stimulates uterine contractions during childbirth. By evaluating the client's uterine contractions, healthcare professionals can assess the progress of labor and ensure the safety of both the client and the baby. Monitoring the client's blood pressure, assessing the client's pain level, and checking the client's respiratory rate are also important, but evaluating the uterine contractions takes priority.