陈凤林教授指出:晚期流产的具体通过以下方法确诊为宫颈松弛：1、病史：诊断宫颈机能不全首先要依据一次或多次的晚期流产病史。　　Professor Chenfenglin pointed out: The specific diagnosis of advanced abortion is cervical relaxation through the following methods: 1. History: Diagnosis of cervical insufficiency must first be based on one or more advanced abortion history.

　　2、妇科检查、扩宫试验：7号扩宫棒可顺利通过宫颈内口。　　2, gynecological examination, palace expansion test: No. 7 palace expansion stick can pass through the cervix.

　　3、辅助检查：B超(已孕)宫颈机能不全早期可以看到宫颈内口的缩短或者成漏斗状(胎膜呈漏斗状进入宫颈内口)。

　　3, auxiliary examination: B Super(pregnant) cervical insufficiency can be seen in the early stage of the cervix shortening or funnel-shaped(fetal membrane funnel-shaped into the cervix).