Transvaginal ultrasonography is a type of gynaecological examination, now commonly used, in which intravaginal head is used. Owing to the use of intravaginal head, the examined organ is located just a few inches from the head of the ultrasonograph which allows to produce incomparably better images of the uterus and ovaries, as compared to the examination by the stomach. Furthermore, such an examination does not require filling the bladder. The test is completely painless. Transvaginal examination may be performed in 3D, if there is such need. It allows to assess the wellbeing of the foetus.