B超检查宫颈长度是多少才能确诊为宫颈松呢?B Super examination cervix length is how much ability be diagnosed as cervical-cervical-pine?

　　陈凤林教授指出：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,有助于宫颈松弛流产的诊断。

　　Professor Chenfenglin pointed out: There is no obvious abdominal pain during pregnancy and B ultrasound internal width & GT; 0.5 cm, cervical tube length & lt; 2.5 cm, helpful for the diagnosis of cervical relaxation miscarriages.