An ultrasound is typically used to confirm a diagnosis. This procedure uses sound waves to create an image of your kidneys. A doctor can also confirm a diagnosis with x-rays, computerized tomography (CT) and magnetic resonance imaging (MRI). Diagnosiscouldalsoinvolveacystoscopy, which uses a long tube with a light and camera at the end (cytoscope) that allows the doctor to look inside the bladder and urethra.
I would actually disagree with the other answerer on this question.
Diagnosis of hydronephrosis is confirmed by pyelogram. The whole purpose of this test is to show you urinary tract system like kidney, bladder, tubes etc. via bright x-ray. The should confirm the diagnosis.
