For the ultrasound examination you should wear comfortable, loose clothing. Maybe you will have to take off all the clothes and jewellery worn in the area of examination.
Other preparations depend on the type of examination you are undergoing. In case of certain imaging, the doctor may instruct you not to eat or drink anything even up to 12 hours before the examination. With other types of imaging, you may need to drink up to six glasses of water two hours before the examination and avoid urinating so that the bladder is full when the imaging begins.