Whether to do B ultrasound for the first time need to fasting holding urine, should be combined with the examination site to determine, if it is for the digestive system, will generally recommend fasting; if it is for the pelvic organs, vagina, will generally require holding urine.
1. Digestive system: for example, for the liver, spleen, gallbladder, kidneys and other parts of the body, generally require fasting, because after eating can not be ruled out that the diagnostic results may cause some interference. And this type of ultrasound generally do not need to hold urine.
2. Pelvis: For example, when men check the prostate, bladder, or women check the uterus and adnexa, generally do not require fasting, but need to hold urine.
3. Vagina: For example, vaginal ultrasound does not require fasting, but you need to hold your urine.
So for different parts of the ultrasound need to have different requirements, before doing the examination can first consult the doctor, and in accordance with the requirements, so as not to affect the diagnostic results.