A patient reports severe flank pain. The urinalysis reveals the presence of calcium phosphate crystals. The nurse will anticipate an order for which diagnostic test?

The correct answer is A: Intravenous pyelogram (IVP). Severe flank pain and calcium phosphate crystals suggest possible kidney stones. IVP is used to visualize the urinary tract, including the kidneys, ureters, and bladder, to identify the presence and location of stones. Cystoscopy (B) is used to examine the bladder and urethra, not the kidneys. Mid-stream urinalysis (C) is a routine urine test and does not specifically diagnose kidney stones. Bladder scan (D) is used to assess bladder volume, not kidney stones.