A nurse is caring for a client who is to undergo electroconvulsive therapy (ECT) for the treatment of depression. Which of the following actions should the nurse take prior to the scheduled ECT? (Select all that apply.)

A. Obtain a urine specimen: While a urine specimen might be collected as part of a general pre-procedure workup, it is not considered a primary, mandatory baseline examination for all clients specifically prior to ECT, B. Request an ECG: An ECG (electrocardiogram) is necessary before ECT to evaluate the client's heart function, as ECT can affect the heart rhythm, and baseline cardiac function should be assessed prior to treatment. C. Obtain a serum parathyroid hormone level: A serum parathyroid hormone level is not required before ECT. This is not a routine test needed for the procedure unless there is a specific concern about calcium metabolism or parathyroid function, which is unrelated to ECT. D. Check the client's blood pressure: Monitoring blood pressure is essential before and after ECT, as fluctuations in blood pressure can occur during the procedure, and any pre-existing hypertension or hypotension should be assessed before performing ECT. E. Witness the informed consent: The nurse is responsible for ensuring that the client has been informed about the procedure, understands the risks and benefits, and signs the consent form. The nurse should witness the informed consent to confirm that it was obtained properly.