Diagnosis of Analgesic Nephropathy
Your doctor will review your medical history and do a physical exam. Other tests may include:

Blood pressure checks

Urine toxicology screen. This test measures the amount of the pain killer in the urine.

Urinalysis. Exam of urine for certain types of cells and chemicals, such as red and white blood cells, infection, or too much protein.

Complete blood count. This test measures the size, number, and maturity of blood cells.

Exam of any tissue passed in the urine

Intravenous pyelogram. A series of X-rays of the kidney, ureters, and bladder. It uses an injection of a contrast dye. This helps find tumors, abnormalities, kidney stones, or any blockages. This test also checks blood flow to the kidney.