A patient is being seen for complaints of severe flank pain lasting for 2 days. The emergency department physician suspects that the patient has renal calculi. Which of the following tests would the nurse expect the health care provider to order?

Choice A reason: Endoscopy visualizes the gastrointestinal or urinary tract but is not the primary test for renal calculi. It may be used for ureteral stones but is invasive and less effective than imaging for initial diagnosis. Choice B reason: Ultrasound can detect renal calculi, especially in pregnant patients or those avoiding radiation, but it is less sensitive than CT for small stones or precise location. It is not the preferred initial test in most cases. Choice C reason: Chest radiography is irrelevant for renal calculi, as it images the thoracic cavity, not the kidneys or ureters. Flank pain from stones is unrelated to chest pathology, making this test inappropriate. Choice D reason: Intravenous pyelogram (IVP) or CT scans are gold standards for diagnosing renal calculi. CT provides detailed images of stone size, location, and obstruction, while IVP assesses urinary tract function, making them the expected tests.