Bishop Score

Cervical Dilation
1. Cervix dilated < 1 cm: 0
2. Cervix dilated 1-2 cm: 1
3. Cervix dilated 2-4 cm: 2
4. Cervix dilated > 4 cm: 3
Cervical Length (Effacement)
1. Cervical Length > 4 cm (0% effaced): 0
2. Cervical Length 2-4 cm (0 to 50% effaced): 1
3. Cervical Length 1-2 cm (50 to 75% effaced): 2
4. Cervical Length < 1 cm (>75% effaced): 3
Cervical Consistency
1. Firm cervical consistency: 0
2. Average cervical consistency: 1
3. Soft cervical consistency: 2
Cervical Position
1. Posterior cervical position: 0
2. Middle or anterior cervical position: 1
Zero Station Notation (presenting part level)
1. Presenting part at ischial spines -3 cm: 0
2. Presenting part at ischial spines -1 cm: 1
3. Presenting part at ischial spines +1 cm: 2
4. Presenting part at ischial spines +2 cm: 3

Add 1 point to score for:
1. Preeclampsia
2. Each prior Vaginal Delivery
Subtract 1 point from score for:
1. Postdates Pregnancy
2. Nulliparity
3. Premature or prolonged Rupture of Membranes

Indications for Cervical Ripening with Prostaglandins
1. Bishop Score <5
2. Membranes intact
3. No regular contractions
Indications for Labor Induction with Pitocin
1. Bishop Score >= 5
2. Rupture of Membranes

Cervical Length >28 mm is as effective as Bishop Score to predict need for ripening agents
1. Park (2011) Obstet Gynecol 38(2): 198-204 [PubMed]