Recommendations
4. The os–placental edge distance on TVS after 35 weeks’
gestation is valuable in planning route of delivery. When
the placental edge lies > 20 mm away from the internal
cervical os, women can be offered a trial of labour with a
high expectation of success. A distance of 20 to 0 mm
away from the os is associated with a higher CS rate,
although vaginal delivery is still possible depending on
the clinical circumstances. (ll-2A)
5. In general, any degree of overlap (> 0 mm) after 35 weeks
is an indication for Caesarean section as the route of
delivery.(ll-2A)