Bishop Score Calculator
Score cervical dilation, effacement, station, consistency, and position to get the Bishop score and assess cervical favorability for labor induction.
8점 이상: 유도분만의 질식분만 성공률이 자연진통과 비슷한 수준으로 평가됩니다.
항목별 기여 점수
보정 요소 (선택 · Calder 수정)
표준 비숍 점수에는 포함되지 않는 참고용 가감 항목입니다. 필요 없으면 그대로 두세요.
표준 8점 − 보정 1점 = 7점
판정 기준
결과 공유
⚠️ 반드시 확인하세요
- 비숍 점수의 5개 항목은 의료진의 내진(골반 진찰)으로만 평가할 수 있습니다. 이 계산기는 진료 중 들은 수치를 합산·해석해 보는 참고용 도구이며 진단이나 의료진의 판단을 대체할 수 없습니다.
- 자궁경부 상태는 수 시간 단위로 변합니다. 며칠 전 내진 결과로 계산한 점수는 현재 상태와 다를 수 있습니다.
- 점수는 유도분만 성공 가능성을 예측할 뿐 결과를 보장하지 않으며, 재태주수·태아 상태·산모 질환 등 다른 요인이 함께 고려됩니다.
- 유도분만 시기와 방법은 반드시 담당 산부인과 의료진과 상담해 결정하세요.
Overview
The Bishop score is the obstetric standard for quantifying whether the cervix is ready for labor induction. Five findings from a pelvic exam — cervical dilation, effacement, fetal station, cervical consistency, and cervical position — are scored and summed to a total of 0–13 points; the first three are worth 0–3 points each and the last two 0–2 points each. A total of 8 or more indicates a favorable cervix, where induction yields a vaginal delivery rate similar to spontaneous labor, while 5 or less indicates an unfavorable cervix that usually calls for cervical ripening first. Select each finding to see the total, its interpretation, and an optional modified score that factors in parity, pre-eclampsia, and other adjustments.
Formula
Bishop score = dilation + effacement + station + consistency + position (dilation/effacement/station 0–3 each, consistency/position 0–2 each, total 0–13) | Dilation: closed 0 / 1–2 cm 1 / 3–4 cm 2 / 5+ cm 3 | Effacement: 0–30% 0 / 40–50% 1 / 60–70% 2 / 80%+ 3 | Station: −3 0 / −2 1 / −1 to 0 2 / +1 to +2 3 | Consistency: firm 0 / medium 1 / soft 2 | Position: posterior 0 / mid 1 / anterior 2 | Interpretation: 9+ very favorable, 8+ favorable, 6–7 intermediate, ≤5 unfavorable | e.g. 2 + 2 + 2 + 1 + 1 = 8 (favorable)
How to Use
- 1Select the cervical dilation found on exam — closed 0, 1–2 cm 1, 3–4 cm 2, 5 cm or more 3.
- 2Select cervical effacement (%) and fetal station — 80%+ effacement and station +1 to +2 each score the maximum 3 points.
- 3Select cervical consistency (firm, medium, soft) and position (posterior, mid, anterior), worth 0–2 points each.
- 4Read the total (0–13) and whether the cervix is favorable, intermediate, or unfavorable.
- 5Optionally add the Calder modifiers — parity, pre-eclampsia, post-term pregnancy, and PPROM — for a reference-only modified score.
Examples
Nulliparous term induction consult — Bishop 7 (intermediate)
A first-time mother at 40 weeks is found to have 1–2 cm dilation (1), 60–70% effacement (2), station −1 (2), medium consistency (1), and a mid-position cervix (1), totaling 7 — just one point short of favorable. Applying the parity modifier for nulliparity (−1) gives a modified score of 6, which is why cervical ripening is often used alongside induction in this situation.
Unfavorable cervix — Bishop 3
Induction is planned at 39 weeks for gestational hypertension, but the exam shows a closed cervix (0), 40–50% effacement (1), station −2 (1), medium consistency (1), and a posterior cervix (0), totaling 3. At 5 or below the cervix is unfavorable, so prostaglandins or a balloon catheter for cervical ripening typically come before oxytocin. Even with the pre-eclampsia modifier (+1), the modified score of 4 stays in the unfavorable range.
Spontaneous labor likely — Bishop 11
A multiparous woman at 41 weeks has 3–4 cm dilation (2), 80%+ effacement (3), station −1 to 0 (2), soft consistency (2), and an anterior cervix (2), totaling 11. Above 9, spontaneous labor is likely within days, and induction would carry a vaginal delivery rate essentially equal to spontaneous labor. With one prior vaginal delivery (+1), the modified score is 12.
Background
The score originates from Edward H. Bishop's 1964 paper 'Pelvic Scoring for Elective Induction' in Obstetrics & Gynecology, which proposed a pelvic scoring table for timing elective induction in multiparous women. The original scored effacement in centimeters; the modified Bishop score used today scores effacement as a percentage and station relative to the ischial spines (−3 to +2). The Calder modifiers — adding 1 point per prior vaginal delivery and 1 for pre-eclampsia, subtracting 1 each for nulliparity, post-term pregnancy, and PPROM — are a separate, reference-only adjustment. ACOG's labor induction guidance uses the Bishop score for cervical assessment and treats 8 or more as a favorable cervix.
Tips
- ✔The Bishop score can only be obtained from a pelvic exam — ultrasound and at-home methods cannot assess dilation, effacement, or station.
- ✔Two cervices with the same total are not identical; higher dilation and effacement subscores tend to predict a smoother induction.
- ✔Cervical status can change within hours, so a score from last week's exam may not reflect today.
- ✔A score of 5 or less does not rule out induction — ripening agents such as prostaglandins or a balloon catheter are used first.
- ✔The modifiers are reference-only; the score recorded in the chart is the unmodified standard Bishop score.
FAQ
Q. What Bishop score means induction will work?
A score of 8 or more is generally considered a favorable cervix, with induction producing a vaginal delivery rate comparable to spontaneous labor. Scores of 6–7 are intermediate, and 5 or less is unfavorable, with higher rates of failed induction and cesarean delivery. The score is a predictor, not a guarantee — gestational age, fetal status, and maternal conditions all factor into the decision.
Q. Does a low Bishop score mean a cesarean?
No. A low score usually means cervical ripening comes first — prostaglandin agents or a balloon catheter — rather than starting oxytocin straight away. Many inductions that begin with an unfavorable cervix still end in vaginal delivery after ripening. Cesarean is a clinical decision made if induction fails to progress or fetal or maternal status requires it.
Q. Can I get a Bishop score without a pelvic exam?
No. All five components require a clinician to palpate the cervix directly. This calculator is for converting findings you were told at a visit (for example, '2 cm dilated and 60% effaced') into a score you can understand.
Q. How does the modified Bishop score differ from the original?
The 1964 original scored cervical effacement by length in centimeters, while the modified version used today scores it as a percentage and reports station relative to the ischial spines. The five components, the 0–13 total, and the interpretation cutoffs are unchanged, and this calculator uses the modified version.
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