Why use it

Standard tool for assessing cervical readiness before induction. Predicts likelihood of successful vaginal delivery. Guides decision on cervical ripening (prostaglandins, mechanical dilators) vs. direct oxytocin.

About

The Bishop Score assesses cervical readiness for induction of labor. It evaluates five components: cervical dilation, effacement, station, consistency, and position. A score ≥ 8 indicates a favorable cervix with high likelihood of successful vaginal delivery after induction. A low score (< 6) suggests the need for cervical ripening before oxytocin.

When to use

Before induction of labor
Assessment of cervical ripening progress
Decision on method of induction

Formula

Sum of 5 cervical examination components (0-3 each except position 0-2): Dilation, Effacement, Station, Consistency, Position Favorable: ≥ 8, Unfavorable: < 6

Pearls & pitfalls

Bishop ≥ 8 in multiparous women has very high success rate with oxytocin alone.
Nulliparous women generally require higher Bishop scores for successful induction.
Modified Bishop Score exists (adds fetal station adjustments) but original remains standard.
Cervical ripening agents (misoprostol, dinoprostone, Foley catheter) improve Bishop score before oxytocin.
The score has limited predictive value for cesarean delivery — clinical judgment is essential.
Assessment is inherently subjective — inter-examiner variability exists.

Next steps

Score ≥ 8: Favorable cervix — oxytocin induction likely to succeed. Score 6-7: Moderately favorable — consider cervical ripening or direct induction based on parity. Score < 6: Unfavorable — cervical ripening recommended (prostaglandin, Foley balloon).

Evidence

Published by Bishop (Obstet Gynecol, 1964). Widely adopted internationally. ACOG and NICE recommend Bishop score assessment before induction. Validated as predictor of induction success in numerous studies.

References

Bishop EH. Pelvic scoring for elective induction. Obstet Gynecol. 1964;24:266-268. — link

Bishop Score

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