A nurse is admitting a client who reports recurrent flank pain and nausea for 24 hr. Which of the following actions should the nurse take first?

Prioritizing care for a client with flank pain and nausea involves applying the nursing process, specifically prioritizing pain management in renal colic. The nurse must recognize that extreme pain triggers physiological stress, necessitating immediate analgesic intervention before performing secondary diagnostic tasks. Choice A rationale Straining urine is an essential diagnostic intervention to identify the presence of calculi, but it does not address the patient's immediate distress. In the hierarchy of care, acute pain relief takes precedence over specimen collection and stone identification. Choice B rationale Ambulation can assist in stone passage, but it is contraindicated during acute, severe pain and nausea. The patient's comfort and safety must be stabilized first to prevent falls and further physiological exhaustion before promoting physical activity or mobility. Choice C rationale Monitoring intake and output is a necessary nursing assessment for evaluating renal function and hydration status. However, it is an ongoing observation rather than an immediate intervention for the acute distress caused by severe flank pain and nausea. Choice D rationale Administering pain medication is the priority because severe renal colic pain can cause autonomic nervous system responses like tachycardia and hypertension. Relief of pain is essential for physiological stability and allows the patient to participate in further diagnostic procedures.