宫颈松弛试验怎么做?How to do cervical relaxation test?

陈凤林教授指出：在了解宫颈松弛试验前要了解宫颈的正常长度，宫颈管正常长度为2.5-3cm,当做妇科检查时，宫颈内口能顺利通过7号扩宫棒，或妊娠期无明显腹痛而B超测内口宽度>0.5cm,宫颈管长度<2.5cm,有助于诊断。从妊娠第4～5个月易发生。

Professor Chenfenglin pointed out: Before understanding the cervical relaxation test, we must understand the normal length of the cervix. The normal length of the cervix tube is 2.5-3cm. As a gynecological examination, the cervix can successfully pass through the 7th dilation stick. Or there is no obvious abdominal pain during pregnancy and B ultrasound internal width & GT; 0.5 cm, cervical tube length & lt; 2.5 cm, which is helpful for diagnosis. From the 4th to 5th month of pregnancy.