 In addition to CL screening for those at risk for PTB, other clinical scenarios may arise in which imaging assessment of the gravid cervix may be of interest. These include suspected preterm labor, induction of labor, and active term labor. Additional clinical scenarios, which may require a focused assessment of the gravid cervix, include suspected abnormal placentation including placenta previa, vasa previa, and lower uterine segment and/or cervical fibroids that may impede progression of labor and potential umbilical cord prolapse. 3-D Transvaginal US Three-dimensional TVUS acquires a volumetric data set that can be reformatted and analyzed in any plane. Three- dimensional TVUS may eventually be of benefit for certain clinical scenarios; however, there is currently insufficient data to recommend its routine use. The American College of Radiology seeks and encourages collaboration with other organizations on the development of the ACR Appropriateness Criteria through society representation on expert panels. Participation by representatives from collaborating societies on the expert panel does not necessarily imply individual or society endorsement of the final document. Reprint requests to: publications@acr.org Assessment of Gravid Cervix US Elastography Cervix US elastography is an imaging technique that assesses tissue stiffness. Although the available data suggest that US elastography may be beneficial in evaluating the gravid cervix [14-17], technical standards and normal reference values are lacking, and the technique remains investigational. As such, there is currently insufficient data to recommend its use in routine screening for PTB in low-risk and high-risk women, suspected preterm labor, and predicting successful induction of labor [18-22].
Assessment of Gravid Cervix.  In addition to CL screening for those at risk for PTB, other clinical scenarios may arise in which imaging assessment of the gravid cervix may be of interest. These include suspected preterm labor, induction of labor, and active term labor. Additional clinical scenarios, which may require a focused assessment of the gravid cervix, include suspected abnormal placentation including placenta previa, vasa previa, and lower uterine segment and/or cervical fibroids that may impede progression of labor and potential umbilical cord prolapse. 3-D Transvaginal US Three-dimensional TVUS acquires a volumetric data set that can be reformatted and analyzed in any plane. Three- dimensional TVUS may eventually be of benefit for certain clinical scenarios; however, there is currently insufficient data to recommend its routine use. The American College of Radiology seeks and encourages collaboration with other organizations on the development of the ACR Appropriateness Criteria through society representation on expert panels. Participation by representatives from collaborating societies on the expert panel does not necessarily imply individual or society endorsement of the final document. Reprint requests to: publications@acr.org Assessment of Gravid Cervix US Elastography Cervix US elastography is an imaging technique that assesses tissue stiffness. Although the available data suggest that US elastography may be beneficial in evaluating the gravid cervix [14-17], technical standards and normal reference values are lacking, and the technique remains investigational. As such, there is currently insufficient data to recommend its use in routine screening for PTB in low-risk and high-risk women, suspected preterm labor, and predicting successful induction of labor [18-22].