Is it necessary to hold urine for a B-ultrasound?

Generally, whether it is necessary to hold urine during a B-ultrasound depends on the specific examination item. For instance, holding urine is required when examining the kidneys, ureters, and other areas. However, for abdominal B-ultrasounds such as those of the liver, gallbladder, spleen, kidneys, and pancreas, it is usually not necessary to hold urine. Detailed explanations are as follows:

When performing an ultrasound examination of the kidneys, ureters, bladder, prostate, uterus, and adnexa, it is necessary to hold urine. These organs are located deep within the pelvic cavity and are surrounded by tissues such as the intestines. When the bladder is full, it can push the intestines upward, allowing the ultrasound waves to penetrate more effectively and providing a clearer visualization of the organs' morphology, size, structure, and any potential abnormalities.

However, for abdominal B-ultrasounds of the liver, gallbladder, spleen, kidneys, pancreas, and other intra-abdominal organs, holding urine is typically unnecessary. These organs are located at higher positions within the abdominal cavity and are generally not affected by the bladder; thus, the ultrasound probe can be placed directly on the corresponding areas of the abdomen for examination.

In daily life, when undergoing examinations of digestive organs such as the liver, gallbladder, and pancreas, it is important to remain fasting. On the night before the examination, one should eat light meals and avoid consuming milk, soy products, sugar, and other foods that are prone to fermentation and gas production on the day of the examination.