Table 1 Robson classification with subdivisions

1

Nulliparous, single cephalic, ≥ 37 weeks, spontaneous labor

2

2a

2b

Nulliparous, single cephalic, ≥ 37 weeks, induced labour or CS before labour

Labour induced

Pre-labour CS

3

Multiparous without previous CS, single, cephalic, ≥ 37 weeks, spontaneous labour

4

4a

4b

Multiparous without previous CS, single, cephalic, ≥ 37 weeks, induced labour or CS before labour

Labour induced

Pre-labour CS

5

5.1

5.2

Multiparous with previous CS, single, cephalic, ≥ 37 weeks

With one previous CS

With two or more CSs

6

All nulliparous breeches

7

All multiparous breeches (including previous CS)

8

All multiple pregnancies (including previous CS)

9

All transverse or oblique lies (including previous CS)

10

All preterm single cephalic, < 37 weeks (including previous CS)