How to do color Doppler ultrasound

Gynecological color Doppler ultrasound mainly includes transabdominal and transvaginal color Doppler ultrasound examination. Before transabdominal color Doppler ultrasound examination, urine should be held. Transvaginal color Doppler ultrasound examination should not hold urine and empty bladder. Transabdominal color Doppler ultrasound examination is to slide the probe in the abdomen for scanning, while transvaginal color Doppler ultrasound is to extend the probe into the vagina for examination.