When the cervical os (opening) is bigger than 2.5 cm or the length has shrunk to less than 20 mm, ultrasonography is used to make the diagnosis. Sometimes there is funneling; this is when the internal cervix, or internal os (a section of the cervix closest to the fetus), has begun to efface. Cervical Incompetence Cervical cerclage has a success rate of 80 to 90 percent, while its usefulness is debatable. Furthermore, there are potential dangers, like as infection or ripping (particularly if labor begins before the sutures are removed), although these are uncommon. In milder instances of cervix incompetence,...