It is clear that to gain access to the area to be examined, the area must be largely bare.
For a breast ultrasound, the patient will be asked to completely undress, but she may keep her pants or skirt on. Breast ultrasounds are often performed in conjunction with mammograms, so the patient remains in the same clothing.
For a transvaginal ultrasound, the patient is in the pelvic position, either with her legs in stirrups or in the frog position.
She is asked to remove her pants and panties, but she often keeps everything that protects her torso. Her T-shirt may be pulled up to expose the abdomen, either for palpation or to insert a traditional probe as an additional measure.
Indeed, no sheets or blankets are provided, but these examinations are performed in the sole presence of the doctor and the patient. There is no need to conceal privacy, even if the partner may also be present. In pregnancy ultrasounds where the baby's siblings can attend, external abdominal imaging is performed.