diagnostic tools/tests: x rays of kidney/ureters/bladder (KUB), ultrasonography, IV urography, retrograde pyelography, abdominal x-rays, intravenous pyelogram (IVP), retrograde pyelogram, kidney ultrasound, MRI scan of abdomen/kidneys, blood chemistries, blood urea nitrogen (BUN) and creatinine tests, 24-hour urine test, chemical studies, urinalysis, and CBCs.