Kidney/Urinary Ultrasound
Preparing for your kidney ultrasound
Quick reference
Scan type
Ultrasound
Duration
20-30 minutes
Preparation
Usually a full bladder
Bring
Referral letter
What is a kidney ultrasound
A kidney (renal) and urinary tract ultrasound uses sound waves to examine the kidneys, bladder and sometimes the ureters (the tubes connecting the kidneys to the bladder). It helps assess kidney size, shape, structure, and can detect cysts, stones, blockages or other changes.
Why might it be requested
This scan may be requested to investigate recurrent urinary tract infections, blood in the urine, kidney stones, abnormal kidney function tests, or to monitor a known kidney or urinary tract condition.
How should I prepare
General guidance: you are usually asked to arrive with a comfortably full bladder. This typically involves drinking approximately 1 to 1.5 litres of water about one hour before the appointment and not emptying your bladder before arriving. A full bladder allows better assessment of the bladder wall and helps position the kidneys for imaging. Always follow the specific instructions from your clinic, as preparation guidance can vary.
What should I wear
Wear comfortable, loose-fitting clothing that allows access to your lower back and abdomen. You may be asked to lie on your back and on your side during the scan.
What happens during the scan
Gel is applied to your abdomen and lower back. The sonographer moves a probe over these areas to image the kidneys. You may be asked to roll onto your side to improve the view of one or both kidneys. The bladder is usually assessed before and sometimes after you empty it. The scan is painless.
Will it hurt
The scan should not be painful. Some pressure may be felt over the kidney areas. A full bladder may feel uncomfortable - tell the sonographer if this becomes difficult.
How long does it take
Approximately 20 to 30 minutes.
When will I get results
Results are sent to your referring clinician, who will discuss findings with you. Ask your imaging centre about expected result timescales.
When should I contact the clinic
Contact your clinic if you have difficulty maintaining a full bladder, have recently had a urine infection, or have any specific concerns before your appointment.
Always follow your clinic specific instructions. The information here is general guidance only. Your clinic may have different requirements.