Final answer:
When a nurse is caring for a client with a Mg level of 2.7 mEq/L, they should assess for signs and symptoms of hypomagnesemia and implement interventions to increase the magnesium level.
Step-by-step explanation:
When caring for a client with a Mg level of 2.7 mEq/L, the nurse should intervene by assessing the client for signs and symptoms of hypomagnesemia, which may include muscle weakness, tremors, and arrhythmias. The nurse should also collaborate with the healthcare team to implement interventions to increase the client's magnesium level, such as administering magnesium supplements and monitoring electrolyte levels.