How long does abdominal ultrasound take to work for kidney stones?

Ultrasound uses sound waves to examine the kidneys and urinary system without radiation. It may identify a stone directly, or show swelling that suggests urine is being blocked. Very small stones, stones in the ureter and other causes of pain may be difficult to see, so a normal scan does not explain every episode of flank pain. Your clinician interprets the images alongside your symptoms, urine findings and examination.

Use the preparation instructions from the imaging service; some appointments ask you to drink water or avoid food for a period beforehand. During the scan, describe the location, movement and severity of your pain. Ask how the result will reach you and whether further imaging or urine testing is needed. Drink fluids according to your clinician's advice, especially if you have kidney, heart or fluid-balance problems.

Get urgent medical care for severe or worsening side pain, fever or chills, repeated vomiting, confusion, faintness, or difficulty passing urine. A blocked urinary tract with infection can become serious. Do not wait for a routine report when these symptoms are present. The Kidney Stones page provides more condition information.

Ask whether the ultrasound is expected to locate the stone or mainly look for blockage, how the report will affect treatment, and what symptoms should trigger same-day review. Clarify whether you need a follow-up test if pain persists despite a reassuring scan.