When examining the liver, spleen, gallbladder and pancreas with Doppler ultrasound, note that the examination must be done on an empty stomach. Be careful not to eat too much fatty food the night before, which can easily cause gallbladder contraction and poor bile filling, affecting the diagnosis of gallbladder disease. Eating easily produces too much gas, which affects the examination of the liver and the examination of the pancreas color ultrasound, Doppler ultrasound examination of the uterine adnexa requires holding urine, to hold until there is a strong feeling of urination, in order to make the bladder fill up as a good transudation window to see clearly the uterus and ovarian structures, color Doppler examination of the bladder and prostate also requires holding urine.