Preparation guide

Preparation for kidney and urinary tract ultrasound

Public guide to confirm full bladder, water, urination, post-void residual, medications, and previous exams before a urinary ultrasound.

How to use this guide

In this exam family, a full bladder is often useful to evaluate the bladder, ureteral jets, and post-void residual when requested.

The facility may define how much water to drink, when to drink it, and a different approach if there is severe pain or difficulty urinating.

This material summarizes the most common preparation, but the final instruction must always be confirmed with the clinic or the requesting physician.

What is commonly requested for this exam

• Ask how much water you should drink and how long beforehand.
• Avoid urinating just before the exam unless instructed by the team.
• Bring previous kidney, bladder, prostate, or urinary tract exams if available.

Quick checklist

• Confirm whether fasting, water intake, full bladder, empty bladder, or a specific time is required.
• Bring the medical request, ID, insurance information, and related prior exams.
• Do not stop medications on your own.
• Inform the clinic about pregnancy, diabetes, mobility limitation, severe pain, or anticoagulant use.

Useful questions to confirm with the clinic

• Do I need to fast? For how many hours?
• Should I drink water? How much and until when?
• Do I need a full or empty bladder?
• Is there different guidance for children, elderly patients, pregnancy, or diabetes?

Other useful preparation guides

• Preparo para ultrassom
• Pelvic
• Complete Abdominal

Published preparation guides

• Complete Abdominal
• Breasts
• Thyroid
• Obstetric
• Pelvic
• Transvaginal
• Urinary Tract
• Venous Doppler

Urinary Tract

Full bladder

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