Table 2

Risk factors for PTB that require referral to the clinic in light of COVID-19 restructure

High riskIntermediate risk
Previous PTB/PPROM (<34+0 weeks)Previous excisional cervical treatment >10 mm depth
Previous MTL (>16 weeks +)Previous >1 excisional treatment or cone biopsy
Incidental finding of a short/open cervixPrevious FDCS*
Previous cervical cerclage
  • FDCS, fully dilated caesarean section; MTL, mid-trimester loss; PPROM, preterm prelabour rupture of membranes; PTB, preterm birth.