Different bladder scanner machines may have slightly different procedures, but the basics of the technique are similar across devices.īladder scanning is not suitable for use on patients with severe abdominal scars, prolapses of the uterus, or current pregnancy. The process can be repeated to better align the bladder in the center of the display. The button is depressed, initiating the machine's evaluation of the bladder's volume, which is then displayed for the operator to see. The patient lies supine, ultrasound gel is to be placed at the suprapubic area, and the probe is then placed on the gel and directed toward the patient's bladder. It is a non-invasive approach to identifying post-void residual. The portable bladder ultrasound device (commonly known as a bladder scanner)Ī portable bladder ultrasound device uses ultrasound to specifically measure the three-dimensional volume of urine in the bladder. Although most studies demonstrate high accuracy of post-void residual using transabdominal point-of-care ultrasound or bladder scanners with automated measurement of bladder volume, other recent studies have brought their accuracy into question. ĭata on the accuracy of transabdominal ultrasound for determining post-void residual is mixed. This method is recommended as the standard calculation because it is fast and easy. The bladder is measured at its maximal transverse (width), longitudinal (length) and anterior-posterior (height) diameters. (Note, the prolate ellipsoid formula has multiple acceptable correction factors.) Transvaginal ultrasound appears especially accurate for measuring low bladder volumes. It measures the bladder’s volume using the ultrasound machine's internal volume calculations or the mathematical equation seen below. The conventional ultrasound is used to visualize the bladder directly, either transabdominally or transvaginally. Ultrasound (conventional or real-time ultrasound) Measurement of post-void residual immediately after voiding is crucial for accurate measurement, with delays of as little as 10 minutes from bladder emptying to post-void residual measurement potentially causing clinically significant overestimation of post-void residual. Urinary catheterization is the gold standard for measuring the post-void residual. Post-void residual evaluation is by measuring the remaining urine in the bladder shortly after a voluntary void this can be accomplished through ultrasound, bladder scan, or by directly measuring the urine volume drained by a urinary catheter.
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