Risk factors for PTB that require referral to the clinic in light of COVID-19 restructure
| High risk | Intermediate 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 cervix | Previous FDCS* |
| Previous cervical cerclage |
FDCS, fully dilated caesarean section; MTL, mid-trimester loss; PPROM, preterm prelabour rupture of membranes; PTB, preterm birth.