Taken together, the data demonstrate that although TVUS has limitations in its predictive ability in identifying those who will progress to PTB, its greatest value is its high negative predicative value. As such, transvaginal assessment of the gravid cervix would be the preferred approach in cases of suspected preterm labor. Although TVUS is not contraindicated in the setting of placenta previa, it should be performed using real-time imaging as the probe is advanced. The safety in this setting is based on the presumption that the angle between the cervix and the vaginal probe is sufficient to prevent the probe from inadvertently slipping into the cervix and that real-time imaging is used throughout the procedure to assess the relationship between the probe tip and the cervix [33]. Variant 4: Assessment of gravid cervix. Induction of labor or active term labor. Initial imaging. US Cervix Transabdominal To our knowledge, there is no relevant literature regarding the use of transabdominal US in the evaluation of the cervix prior to induction of labor or during active term labor. However, a meta-analysis of 31 studies demonstrated limited value in predicting the outcome of induced labor [49]. Studies that are more recent also report conflicting data. In one study, a shorter CL prior to induction was associated Although TVUS is not contraindicated in the setting of placenta previa, it should be performed using real-time imaging as the probe is advanced. The safety in this setting is based on the presumption that the angle between the cervix and the vaginal probe is sufficient to prevent the probe from inadvertently slipping into the cervix and that real-time imaging is used throughout the procedure to assess the relationship between the probe tip and the cervix [33]. Supporting Documents The evidence table, literature search, and appendix for this topic are available at https://acsearch. acr.org/list.
Assessment of Gravid Cervix. Taken together, the data demonstrate that although TVUS has limitations in its predictive ability in identifying those who will progress to PTB, its greatest value is its high negative predicative value. As such, transvaginal assessment of the gravid cervix would be the preferred approach in cases of suspected preterm labor. Although TVUS is not contraindicated in the setting of placenta previa, it should be performed using real-time imaging as the probe is advanced. The safety in this setting is based on the presumption that the angle between the cervix and the vaginal probe is sufficient to prevent the probe from inadvertently slipping into the cervix and that real-time imaging is used throughout the procedure to assess the relationship between the probe tip and the cervix [33]. Variant 4: Assessment of gravid cervix. Induction of labor or active term labor. Initial imaging. US Cervix Transabdominal To our knowledge, there is no relevant literature regarding the use of transabdominal US in the evaluation of the cervix prior to induction of labor or during active term labor. However, a meta-analysis of 31 studies demonstrated limited value in predicting the outcome of induced labor [49]. Studies that are more recent also report conflicting data. In one study, a shorter CL prior to induction was associated Although TVUS is not contraindicated in the setting of placenta previa, it should be performed using real-time imaging as the probe is advanced. The safety in this setting is based on the presumption that the angle between the cervix and the vaginal probe is sufficient to prevent the probe from inadvertently slipping into the cervix and that real-time imaging is used throughout the procedure to assess the relationship between the probe tip and the cervix [33]. Supporting Documents The evidence table, literature search, and appendix for this topic are available at https://acsearch. acr.org/list.