Bishop Score & Induction Calculator

Pre-labour cervical evaluation to predict induction success, necessity of mechanical/chemical cervical ripening, and vaginal delivery likelihood.

Quick Clinical Presets:

1Cervical Dilation

Internal os diameter measured digitally in centimeters

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2Cervical Effacement / Length

Thinning and shortening of the cervical canal

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3Fetal Station (Descent)

Leading bony vertex relative to maternal ischial spines (-3 to +3)

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4Consistency

Tissue compliance

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5Position

Orientation to pelvic axis

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Calculated Bishop ScoreUnfavorable (<=6)

0/ 13

0 (Unripe)6-7 Threshold13 (Fully Ripe)

The cervix is not yet prepared for immediate labour. Inducing with oxytocin alone carries a high failure rate and substantially elevated cesarean delivery odds.

SOGC Induction Recommendation

SOGC guidelines recommend formal cervical ripening prior to amniotomy or oxytocin infusion. Mechanical methods (Foley balloon catheter 30-60 mL) or controlled-release Dinoprostone (Cervidil 10 mg) are first-line. Mechanical balloons have equivalent delivery rates to prostaglandins with significantly lower tachysystole risk.

Evidence-Based Modalities

Mechanical Foley Catheter: 16-18 Fr balloon filled with 30-60 mL saline, placed intracervically. Safe for outpatient ripening and TOLAC/VBAC.

Dinoprostone (Cervidil) 10 mg vaginal insert with tape: left in situ up to 24h; easily removed if tachysystole occurs. Contraindicated in prior cesarean.

Oral Misoprostol (PGE1) 25 mcg q4-6h: low-dose oral titration where institutional protocol exists. Strictly contraindicated in VBAC.

Induction Contraindications

Previous classical or inverted-T uterine incision (uterine rupture risk).
Complete placenta previa or vasa previa.
Active primary genital herpes simplex virus infection.
Transverse fetal lie or non-cephalic presentation.
Prostaglandins (Dinoprostone / Misoprostol) are contraindicated in TOLAC / VBAC (use Foley balloon instead).

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