Printed on 3/17/2026
For informational purposes only. This is not medical advice.
The Bishop Score is a pre-labor scoring system used to assess the readiness of the cervix for induction of labor. It evaluates five components: cervical dilation, effacement, station, consistency, and position. A higher score indicates a more favorable cervix and a higher likelihood of successful induction. Scores ≥ 8 are considered favorable.
Formula: Bishop = Dilation(0–3) + Effacement(0–3) + Station(0–3) + Consistency(0–2) + Position(0–2)
Assess five cervical characteristics during digital examination: dilation, effacement, station of presenting part, consistency, and position.
Assign 0–3 points for dilation, effacement, and station. Assign 0–2 points for consistency and position. Each characteristic has defined criteria.
Sum all components (max 13). Score ≥8 is favorable; ≤5 is unfavorable. Use the score to guide induction method selection and patient counseling.
OB/GYNs, midwives
Determine whether to proceed with immediate induction or first ripen the cervix. A favorable score allows oxytocin alone; unfavorable scores warrant ripening agents.
Obstetric providers
Set appropriate expectations. Patients with low Bishop scores need to understand that induction may take longer and has higher chance of cesarean delivery. Confirm gestational age with [Gestational Age Calculator](/tools/gestational-age) before planning induction.
Labor and delivery nurses, residents
Standardized scoring provides objective documentation of cervical status. Comparing scores over time tracks labor progression.
Clinical researchers
Bishop score is a standard variable in induction research. It allows comparison of outcomes across studies and evaluation of new induction methods.
MFM specialists
High-risk patients with unfavorable cervices may warrant closer monitoring or different approaches. The score helps quantify induction difficulty.
Medical students, residents
Teaching tool for cervical assessment. Standardized scoring creates common language and promotes consistent evaluation technique.
Among the five components, cervical dilation correlates most strongly with induction success. A closed cervix is the biggest obstacle; other components have smaller independent effects.
Some protocols use a simplified 3-component score (dilation, effacement, station). This reduces subjectivity from consistency and position assessments.
First-time mothers typically have firmer, more posterior, and less dilated cervices. A Bishop score of 5 in a nullipara is more favorable than it sounds.
Cervical status can change over hours, especially once ripening agents are applied. Re-assess before starting oxytocin if significant time has passed.
Transvaginal ultrasound cervical length measurement can complement Bishop score. Short cervix (<25 mm) predicts faster induction even with low Bishop score.
Multiparous women induce faster than nulliparous at the same Bishop score. Prior vaginal delivery is a strong predictor of successful vaginal delivery.
Inter-examiner variability is significant. When possible, have the same provider perform serial examinations to minimize subjective variation.
Station measurement varies between the traditional (−5 to +5) and thirds (−3 to +3) systems. Use consistent terminology and know your institution's convention.
If the Bishop score is ≤5, discuss ripening methods (misoprostol, dinoprostone, Foley balloon) with the patient before scheduling induction.
Some protocols consider ≥6 favorable; others use ≥8. Know your institution's cutoff. The original Bishop paper used 9 as highly favorable.
The Bishop Score was developed by Edward Bishop in 1964 (Obstet Gynecol 24:266). It remains the standard clinical tool for assessing cervical favorability despite being 60 years old. ACOG guidelines reference Bishop Score for induction planning. Meta-analyses confirm higher scores predict shorter induction times and lower cesarean rates.
The Bishop Score ranges from 0 to 13. A score of 8 or higher indicates a favorable cervix — the likelihood of a successful vaginal delivery following induction is similar to that of spontaneous labor, and induction can typically proceed with oxytocin alone. Scores of 6–7 are considered intermediate, where induction may succeed but may take longer or require additional interventions.
A score of 5 or below indicates an unfavorable cervix. Induction in this setting carries a higher risk of prolonged labor, failed induction, and cesarean delivery. Cervical ripening agents — such as prostaglandins (misoprostol, dinoprostone) or mechanical methods (Foley balloon catheter) — are typically recommended before initiating oxytocin to improve the chances of successful induction.
Use the Bishop Score when considering induction of labor to assess whether the cervix is sufficiently prepared for the induction process. Common indications for induction include post-term pregnancy (41 or more weeks), preeclampsia, gestational diabetes with poor control, premature rupture of membranes, oligohydramnios, and other maternal or fetal conditions where continued pregnancy poses a risk.
The score should be assessed by the clinician performing the cervical examination, ideally at the time the decision to induce is being made. It helps guide the choice of induction method: favorable scores may allow direct oxytocin augmentation, while unfavorable scores warrant cervical ripening first. It is also useful for counseling patients about the expected duration and likelihood of success of their induction.
The Bishop Score relies on subjective assessment of cervical characteristics during digital examination. Interobserver variability is well documented — different examiners may assign different scores to the same cervix, particularly for effacement, consistency, and station. This subjectivity limits reproducibility and can affect clinical decision-making.
The score was originally developed in 1964 for multiparous women and may be less predictive in nulliparous patients, who tend to have lower scores even when induction is likely to succeed. Some studies suggest that cervical length measured by transvaginal ultrasound (use [Gestational Age Calculator](/tools/gestational-age) for dating) may be a more objective and reproducible predictor of induction success than the Bishop Score, though the Bishop Score remains more widely used in clinical practice.
The score predicts the likelihood of vaginal delivery but does not account for other important factors that influence induction outcomes, including fetal size, maternal BMI (assess with [BMI Calculator](/tools/bmi-calculator)), parity, reason for induction, and the specific induction protocol used.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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