A client with renal calculi is experiencing hematuria and reports severe flank pain. Which intervention should the nurse implement first?

A. Administer a prescribed opioid analgesic: Pain relief is the priority in this situation, as the client is experiencing severe pain from the renal calculi. B. Strain the urine for the presence of stones: Straining urine is important but not the first intervention when the client is in severe pain. C. Prepare the client for a prescribed computed tomography (CT) scan: Although imaging is needed, pain relief should be prioritized first. D. Obtain a urine specimen for analysis: While urine analysis is necessary, pain management should take precedence.