You do not need to empty your stomach or hold your urine for a vaginal ultrasound, you just need to empty your urine. If you have recently digested not very good, hangover, feel dry stools, it is recommended that you take laxatives before doing vaginal ultrasound as much as possible to empty the stools, the examination will observe the image will be clearer. Clinical need to fasting ultrasound mainly upper abdomen ultrasound, the upper abdomen is mainly to do the examination of the liver, gallbladder, pancreas and spleen, fasting is conducive to the emptying of the gallbladder, to observe the contraction function of the gallbladder. Ultrasound commonly used in obstetrics and gynecology, such as in the observation of early pregnancy or clinical examination, that is, the usual physical examination, women’s physical examination to observe the uterine adnexa is the need to hold urine in the case, the first 3 months of pregnancy also need to hold urine for examination. In the second trimester to late pregnancy, there is no need to hold urine or fasting, and the examination can be performed. Vaginal ultrasound for clinical diagnosis of common gynecological diseases and diseases still have advantages, as long as the married women who have sex to consult the case, the first recommendation is to do vaginal ultrasound, because vaginal ultrasound avoids the abdominal wall tissues, directly through the pressure, squeeze the abdomen, the intestinal gases are also pushed away, the uterus, adnexa situation is exposed to the full, the images are clear, the clarity of the observation is superior to the abdominal ultrasound examination, especially in the case of elderly women due to the postmenopausal period, the vagina is also a very important part of the examination, but also a very important part of the examination. Especially in elderly women, due to the atrophy of the uterus after menopause, the volume is particularly small, coupled with the atrophy of the ovaries, the conventional abdominal ultrasound is not easy to recognize, if you do a negative ultrasound of the above situation can be solved.