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Information Resources Diagnostics > Radio Diagnosis Ascending Urethrogram (RGU or ASU)

                                                                                                               

Overview

This page provides important information about the RGU examination. If you are to undergo this procedure, we hope you will take
the time to read it before coming for your appointment. Please feel free to discuss any questions you may have with our radiology staff.
 
 

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Q1. What is an ASU (RGU)?
A1.

RGU (radio diagnosis ascending urethrogram) is a special x-ray procedure performed to evaluate the urethra in order to rule out any abnormalities such as stricture (narrowing), etc.

An RGU is conducted for patients in whom an abnormality of the urethra is suspected after clinical evaluation and other relevant investigations such as an ultrasound scanning have taken place.

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Q2. What happens during this procedure?                                                                                                                         top
A2.

A suitable quantity of contrast medium is 'injected' into the urethra retrogradely after adequately anaesthetising the urethra, during which time a radiograph is taken. This procedure is performed under strict aseptic precaution. 

The contrast medium is injected into the urethra by placing a nozzle of a syringe loaded with the contrast medium into the end of the urethra at the tip of the penis and pushing the contents of the syringe into the urethra. The contents flow backwards and spill into the bladder. This is captured on an x-ray film to document the findings.

Your doctor may ask you to get this procedure performed if you have any one of the following conditions: 

  • Difficulty in urination
  • Injury to the genital area or behind the scrotum. 

The test can't be performed in case you have an active urinary infection or pain during the instillation of the contrast medium 

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Points to Note

  • This procedure does not require any preparation.

  • The patient will 'feel' the contrast flow through the urethra into the bladder.

  • This procedure does not involve any adverse reaction of the contrast agent used.

  • You may have a reaction to the contrast medium or the local anaesthetic agent itself. Very rarely, this can be life-threatening. But more commonly, if a reaction takes place, you will only experience discomfort when the local anaesthetic agent or the contrast medium is inserted. 

  • Please bring along all your previous records and lab reports.

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