Bishop Score
Calculate the Bishop score to assess cervical ripeness for labor induction using 5 components: dilation, effacement, consistency, station, and position. Get score, interpretation, and breakdown with charts.
Bishop Score Parameters
Select the findings from cervical examination to calculate the Bishop score (0–13).
About This Calculator
The Bishop Score Calculator is a clinical tool used by obstetricians, midwives, and other healthcare professionals to assess cervical ripeness and predict the likelihood of successful labor induction. Developed by Dr. Edward Bishop in 1964 and published in the journal Medical Clinics of North America, the Bishop scoring system evaluates 5 components of the cervical examination to determine whether the cervix is favorable (ripe) for induction of labor. This widely used scoring system helps guide clinical decision-making when induction is being considered for medical or obstetric indications.
The scoring methodology evaluates: cervical dilation (0–3 points), cervical effacement as a percentage of thinning (0–3 points), cervical consistency based on tactile assessment (0–2 points), fetal station measured relative to the maternal ischial spines (0–3 points), and the baby's head position relative to the maternal pelvis (0–2 points). Each component is assigned points based on the clinical findings, for a total Bishop Score ranging from 0 to 13. A score of 8 or more indicates a favorable cervix where induction is likely to succeed, while a score of 4 or less suggests an unfavorable cervix that may require cervical ripening before induction. The assessment is performed via a vaginal examination by a qualified healthcare provider.
The Bishop Score is most accurate when performed by an experienced clinician and is most predictive for term pregnancies (37 weeks or more). While the score is the gold standard for pre-induction cervical assessment, it does have limitations including inter-observer variability and reduced predictive value in certain populations such as obese patients or those with previous cesarean sections. The score should always be interpreted in the context of the patient's full clinical picture, including parity, gestational age, fetal status, and maternal medical conditions.
Regional notes: The Bishop Score is used internationally. In the United States, the American College of Obstetricians and Gynecologists (ACOG) recommends the Bishop Score for pre-induction cervical assessment and it is standard practice in virtually all US hospitals with obstetric services. In the United Kingdom, the National Institute for Health and Care Excellence (NICE) guidelines recommend the Bishop Score for assessing the favorability of the cervix before induction of labor, and it is routinely used in NHS maternity units. In India, the Federation of Obstetric and Gynaecological Societies of India (FOGSI) recognizes the Bishop Score as part of standard pre-induction evaluation, and it is widely used in both public and private obstetric practice across the country.
Frequently Asked Questions
What is the Bishop Score?
The Bishop Score is a clinical scoring system used by obstetricians and midwives to assess cervical ripeness and predict the likelihood of successful labor induction. Developed by Dr. Edward Bishop in 1964, it evaluates 5 components: cervical dilation, cervical effacement, cervical consistency, fetal station, and baby's head position. The total score ranges from 0 to 13, with higher scores indicating a more favorable cervix for vaginal delivery after induction.
What does a Bishop Score of 8 or more mean?
A Bishop Score of 8 or more out of 13 indicates a favorable cervix (ripe cervix). When the score is 8 or higher, the likelihood of successful vaginal delivery after labor induction is similar to that after spontaneous labor. Induction can usually proceed without the need for additional cervical ripening agents. The cervix is soft, dilated, effaced, and the baby's head is well-positioned and engaged.
What does a Bishop Score of 4 or less mean?
A Bishop Score of 4 or less indicates an unfavorable cervix that is not ripe for induction. If labor induction is medically necessary despite a low Bishop score, the healthcare provider will typically recommend cervical ripening methods first. These may include pharmacological agents such as prostaglandins (misoprostol, dinoprostone) or mechanical methods such as a Foley catheter or membrane sweep. After ripening, the Bishop score is reassessed before proceeding with oxytocin induction.
What are the 5 components of the Bishop Score?
The 5 components of the Bishop Score are: 1) Cervical dilation (0–3 points): how open the cervix is, from closed to ≥5 cm. 2) Cervical effacement (0–3 points): the thinning of the cervix, from 0–30% to ≥80%. 3) Cervical consistency (0–2 points): how soft the cervix feels, from firm to soft. 4) Fetal station (0–3 points): the descent of the baby's head relative to the ischial spines, from –3 to +1/+2. 5) Baby's head position (0–2 points): the position of the baby's occiput relative to the mother's pelvis, from posterior to anterior. The maximum total score is 13.
What is the difference between Bishop Score and modified Bishop Score?
The original Bishop Score (0–13) includes all 5 components. Some clinicians use a modified Bishop Score that omits the position component or assigns different point values. A common modification excludes the baby's head position, resulting in a score out of 11. Another modification uses a 0–2 scale for station instead of 0–3. The 5-component (0–13) version remains the most widely used in clinical practice and is the version used in this calculator.
Can the Bishop Score predict the success of induction?
Yes, the Bishop Score is the most commonly used tool to predict the success of labor induction. A higher Bishop score correlates with a shorter interval to delivery and a higher rate of vaginal delivery after induction. However, the Bishop Score has limitations: it is subjective (dependent on examiner skill), has inter-observer variability, and does not account for other factors such as maternal age, BMI, parity, gestational age, or fetal weight. The Bishop Score should be used as part of a comprehensive clinical assessment, not as the sole predictor of induction outcome.
When is labor induction recommended?
Labor induction may be recommended for several medical reasons: post-term pregnancy (beyond 42 weeks or 38 weeks for twins), premature rupture of membranes (PROM) without spontaneous labor, preeclampsia or eclampsia, gestational diabetes or pre-existing diabetes, intrauterine growth restriction (IUGR), maternal conditions such as hypertension or kidney disease, chorioamnionitis, fetal distress, and oligohydramnios (low amniotic fluid). The decision to induce labor should be made jointly by the patient and healthcare provider based on the balance of risks and benefits.
What is the difference between Bishop Score and APGAR Score?
The Bishop Score and APGAR Score serve different purposes. The Bishop Score is assessed before labor begins to evaluate cervical readiness for induction. The APGAR Score is assessed after delivery (at 1 and 5 minutes of life) to evaluate the newborn's health status based on appearance, pulse, grimace, activity, and respiration. They are used at completely different stages of pregnancy and childbirth.