Final answer:
The bladder scanner is a non-invasive medical device used to measure the volume of urine in a patient's bladder and determine residual urine volume.
Step-by-step explanation:
The bladder scanner is a non-invasive medical device used to measure the volume of urine in a patient's bladder. It is often used to determine residual urine volume, which refers to the amount of urine left in the bladder after urination. The bladder scanner uses ultrasound technology to create images of the bladder and calculate the volume of urine present.
To perform a bladder scanner residual urine volume test, the patient lies on their back and a handheld scanner is placed on their lower abdomen. The scanner emits ultrasound waves that bounce off the bladder and return to the scanner, creating an image on the screen. The device then calculates the volume of urine based on the dimensions of the bladder.