Mr. Blevins is a 25-year-old male with a history of hypertension and gastric reflux. When he arrives in the emergency department, he is complaining of right-sided flank pain, dysuria, nausea, vomiting, and chills. His vital signs are: blood pressure 150/90, temperature 99.2°F, pulse 90, and respirations 18. He is flushed and diaphoretic.

The healthcare provider initially orders a urinalysis. With Mr. Blevins' symptoms, why would a urinalysis be one of the initial tests ordered?