"fetal fibronectin (fFN) test on vaginal mucus: needs to be done before trans-vaginal scanning is attempted"
"Sonographic determination of the residual closed length of the cervix may be measured if there is:"
Expected headings
"Clinical tests"
"Technique"
"Sonographic findings"
"Transvaginal, translabial or transperineal sonography is most commonly used to assess the cervix."