The most accurate way to examine your cervical length is through transvaginal ultrasound. During this examination, you will be asked to lie on your back with your knees slightly bent, pointing towards your chest. You must remove all clothing from the lower part of your body as it is an internal female genitalia examination.
Your examiner gently and slowly inserts an ultrasound probe with a sterile and latex-free sheath and gel 2-3 inches (5-8 cm) into your vagina. Sound waves from the ultrasound send images to a screen.