Ultrasound Protocol Library / Bladder Ultrasound Protocol
Examination protocol
Bladder Ultrasound Protocol
A step-by-step demonstration of bladder preparation, transverse and sagittal survey, volume measurement, evaluation of adjacent structures, and complete image documentation.
Protocol demonstration
Bladder Ultrasound Examination Protocol
Watch the complete examination once, then repeat it while following the preparation and documentation guide below.
Before the examination
Preparation
- Confirm the indication and determine whether the examination requires a comfortably full bladder, prevoid volume, or postvoid residual.
- Select a low-frequency curvilinear transducer and an appropriate pelvic or bladder preset.
- Position the patient supine, provide draping, and explain when voiding will occur if a postvoid study is ordered.
- Record relevant timing and conditions, especially when comparing prevoid and postvoid measurements.
During the examination
Scanning sequence
- Sweep the bladder from superior to inferior in transverse plane and from side to side in sagittal plane.
- Evaluate the lumen, wall, bladder base, distal ureters, and adjacent structures while adjusting gain and focal zone.
- Obtain three orthogonal internal dimensions for volume calculation when volume is required.
- After voiding, repeat the volume measurement promptly and document residual urine when ordered.
Required record
Images and documentation
- Representative labeled transverse and sagittal images demonstrating the bladder and its base.
- Three orthogonal internal dimensions and calculated volume when requested.
- Prevoid and postvoid conditions, including the timing of the postvoid acquisition when relevant.
- Each focal abnormality in two planes, with measurements and Doppler assessment when appropriate.
Quality review
Common pitfalls
- Calling apparent wall thickening in an underdistended bladder without considering the degree of filling.
- Mistaking adjacent pelvic structures, bowel, or artifact for an intravesical lesion.
- Using oblique or external-wall measurements that produce an inaccurate calculated volume.
- Failing to document whether images and measurements were obtained before or after voiding.
Knowledge check
Check your understanding
Answer each question before opening it to compare your response with the teaching point.
Why is bladder distention important when evaluating the wall?
An underdistended bladder can make the wall appear falsely thick and can limit evaluation of the lumen and bladder base.
Which measurements are used to calculate bladder volume?
Three orthogonal internal dimensions—typically length, width, and height—are obtained in appropriately aligned planes and entered into the system's volume formula.
What information belongs with a postvoid residual measurement?
Identify it as postvoid, document the measured residual volume, and record relevant timing or limitations according to local policy.