Bishop Score Calculator
Calculate the Bishop score to assess cervical readiness for labor induction.
What Is the Bishop Score?
The Bishop score is a clinical scoring system used to evaluate the cervix before labor induction. It assesses five key components: cervical dilation, effacement (length), consistency, position, and the station of the presenting fetal part relative to the maternal pelvis. Each component receives a score, and the total helps clinicians determine how favorable the cervix is for induction.
A higher total score indicates a more favorable cervix and a higher likelihood of successful induction. A lower score suggests the cervix is less ready, which may influence decisions about induction timing or the use of cervical ripening agents.
How the Bishop Score Is Calculated
Each of the five cervical parameters is assigned a score from 0 to 2 or 0 to 3, depending on the component. The scores are then summed to produce a total Bishop score.
| Component | Score 0 | Score 1 | Score 2 | Score 3 |
|---|---|---|---|---|
| Dilation (cm) | Closed | 1–2 | 3–4 | 5+ |
| Effacement (%) | 0–30 | 40–50 | 60–70 | 80+ |
| Consistency | Firm | Medium | Soft | — |
| Position | Posterior | Midposition | Anterior | — |
| Station | −3 | −2 | −1, 0 | +1, +2 |
The maximum possible score is 13. A score of 8 or higher is generally considered favorable for induction. Scores below 6 often indicate that cervical ripening may be needed before induction can proceed.
How to Use This Calculator
Select the value that best matches the cervical exam findings for each of the five components. The calculator will automatically sum the scores and display the total Bishop score. No manual addition is required.
This tool is intended for healthcare professionals familiar with the Bishop scoring system. It provides a quick, standardized way to calculate the score during a cervical assessment.
Interpreting the Results
The total Bishop score helps guide clinical decisions about labor induction:
- Score 8–13: Favorable cervix. Induction is likely to succeed without additional cervical ripening.
- Score 6–7: Moderately favorable. Induction may be attempted, but some clinicians may opt for cervical ripening depending on the clinical context.
- Score 0–5: Unfavorable cervix. Cervical ripening agents (e.g., prostaglandins, mechanical dilators) are typically recommended before induction.
The Bishop score is one factor among many in the decision to induce labor. Other considerations include gestational age, fetal well-being, maternal health, and obstetric history.
Limitations of the Bishop Score
The Bishop score is a useful clinical tool, but it has limitations:
- It is a subjective assessment that can vary between examiners.
- It does not account for all factors that influence induction success, such as parity, fetal size, or placental function.
- A low score does not guarantee induction failure, nor does a high score guarantee success.
- The scoring system was originally developed for term pregnancies and may be less predictive in preterm or post-term inductions.
Clinicians should use the Bishop score as part of a broader clinical evaluation rather than as a standalone predictor.
Common Clinical Use Cases
The Bishop score is most commonly used in the following scenarios:
- Pre-induction assessment: To determine whether the cervix is favorable for induction of labor.
- Decision support for cervical ripening: To identify patients who may benefit from ripening agents before induction.
- Monitoring cervical change: To track changes in cervical status over time, especially in outpatient induction planning.
- Research and documentation: To standardize cervical assessment in clinical studies or medical records.
Frequently Asked Questions
What is a good Bishop score for induction?
A Bishop score of 8 or higher is generally considered favorable for labor induction. Scores in this range suggest the cervix is ready and induction is likely to succeed without additional cervical ripening.
Can the Bishop score predict the success of induction?
The Bishop score is a useful predictor, but it is not perfectly accurate. Higher scores correlate with higher success rates, but individual outcomes depend on many factors including parity, fetal position, and maternal health. The score is best used as a guide rather than a guarantee.
What does a Bishop score of 5 mean?
A score of 5 is considered unfavorable. It typically indicates that the cervix is not yet ready for induction, and cervical ripening methods may be recommended before proceeding with induction of labor.
Is the Bishop score used for all pregnancies?
The Bishop score is most commonly used for term pregnancies (37 weeks or later). Its predictive value may be different for preterm or post-term inductions. Clinicians may also use modified versions of the score in certain situations.
How is cervical station measured in the Bishop score?
Station refers to the position of the fetal presenting part relative to the ischial spines of the maternal pelvis. It is measured on a scale from −5 to +5. In the Bishop score, station is scored from −3 (high) to +2 (low), with lower (more descended) stations receiving higher scores.