Formula for calculating residual urine volume

The most common way to detect residual urine is to use ultrasound examination. After telling the patient to urinate normally, immediately do a B-ultrasound to detect the residual liquid volume in it. Ultrasound can detect the anteroposterior diameter, upper and lower diameter, and left and right diameter of this liquid. Think of it as a sphere. Then use the unit of centimeter. Its calculation formula is to multiply these three paths together and then divide by two to obtain a rough volume in milliliters. To be specific, the anteroposterior diameter multiplied by the left-right diameter multiplied by the upper-lower diameter, multiplied by 0.52, to obtain a value. The most accurate method is to insert a catheter after urination to extract the residual urine and accurately calculate the volume.