The Bishop score is used to assess cervical favourability before induction of labour. A Bishop score is calculated: dilation 2 cm (2 pts), effacement 50% (1 pt), consistency medium (1 pt), position mid/central (1 pt), station -2 (1 pt) = total 6. A Bishop score of 6 in a nulliparous woman predicts:
- A Unfavourable cervix; cervical ripening required before induction
- B Favourable cervix; induction likely to succeed with oxytocin augmentation ✓
- C Immediate delivery by cesarean section recommended
- D Equivalent success rate to cervical ripening with prostaglandins
Correct answer: B. Favourable cervix; induction likely to succeed with oxytocin augmentation
Explanation
A Bishop score ≥6 in a nulliparous woman (and ≥8 in multiparas, though some sources use 6 for both) indicates a favourable cervix, predicting a high likelihood of successful vaginal delivery after oxytocin induction, with success rates comparable to spontaneous labour. Cervical ripening with prostaglandins or mechanical methods is recommended when Bishop score is <6 (unfavourable). A score of 6 places this nullipara at the borderline-to-favourable range where induction with oxytocin is appropriate without mandatory prior ripening.
Reference: Williams Obstetrics, 26th ed.
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Written and medically reviewed by the StethoPrep medical team.