Cervical function can be checked by iodine oil imaging, ultrasound and cervical dilatation stick. 1. Iodine oil contrast examination: patients can take iodine oil contrast examination, so as to know the width of the cervical opening, as well as whether the fallopian tube is open and the degree of openness. If the patient has a blockage, it can also determine the location of the blockage. 2. Ultrasound: Patients can also undergo ultrasound to check the length and width of the cervix, as well as the dilatation of the endocervix. This method is suitable for both pregnant and non-pregnant women. 3. Cervical Dilatation: The patient can also use a #8 dilatation wand. If this procedure can enter the endocervix without any resistance, it indicates the presence of cervical insufficiency. If the patient needs to check cervical function, he or she can ask the doctor for guidance. Once abnormal cervical function occurs, the patient should actively cooperate with the doctor to take relevant treatment measures. Daily, you should keep the local skin clean and dry.