[Verified Answer]: Case Study #1: A routine urinalysis…

Case Study #1: A routine urinalysis specimen is sent to the laboratory from a patient suspected of having renal calculi. When the microscopic examination is performed unusual crystals that resemble cholesterol plates are observed. The technologist is suspicious and performs a sulfosalicylic acid precipitation test (SSA test for protein) and checks the specific gravity by refractometry. The patient care unit is contacted for a list of current medications. The list reveals that the patient had an intravenous pyelogram 6 hours earlier. The patient is taking no other medications except those given during the intravenous pyelogram procedure (Demerol and Xylocaine)