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Bishop score

Assesses cervical favourability for induction by vaginal examination and guides whether cervical preparation is needed.

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Check the population, units and version. The result shows the formula or classification; it does not make an automatic treatment decision.

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Method · Limits of application

Bishop 1964: 5 components 0–13; percentage effacement, not cervical-length version

Classic Bishop describes cervical readiness using five examination components and does not by itself authorize labor induction. The 1964 paper studied a historical multiparous population from 36 weeks; this is not a current indication for elective induction at that gestational age. The consulted ACOG institutional guidance requires assessment of obstetric indications and contraindications and no elective induction before 39 weeks. This version uses cervical effacement as a percentage, not a modified version based on cervical length.

Conditions of use

Check the population, units, inclusion and exclusion criteria, and version in the original source. A result alone does not establish a diagnosis, discharge decision or prescription.

Documented parameters

Dilation
Cervical effacement
Fetal station (De Lee)
Cervical consistency
Cervical position

4/4 reference cases checked. Numerical tests are not clinical validation.

Sources and documentation

Documented formula

Transcribed from the source or a recorded revision; this is not a clinical recommendation.

Sum of 5 vaginal-examination items: dilatation (0–3), effacement (0–3), station (0–3), consistency (0–2) and cervical position (0–2). Total 0–13.

References

Identifier: indice-de-bishop

Original clinical content: Brazilian Portuguese.

Method version

Bishop 1964: 5 components 0–13; percentage effacement, not cervical-length version

indice-de-bishop@native-2026-10-05+e86e245c6cb5

Bishop EH. Pelvic scoring for elective induction. Obstet Gynecol, 1964.

The bibliographic edition identifies the source. By itself, it proves neither full conformity of the formula nor clinical approval.

Synthetic cases checked (4)

Synthetic cases for checking the implementation, with no patient data.

Case 1

reference-001

Inputs

Dilation: 1 to 2 cm
Cervical effacement: 40 to 50%
Fetal station (De Lee): −2
Cervical consistency: Firm
Cervical position: Posterior

{
  "dil": "1",
  "apag": "1",
  "alt": "1",
  "cons": "0",
  "pos": "0"
}

Expected result

{
  "score": 3,
  "level": "high"
}

Actual result

{
  "score": 3
}

Case 2

reference-002

Inputs

Dilation: 1 to 2 cm
Cervical effacement: 60 to 70%
Fetal station (De Lee): −1 or 0
Cervical consistency: Soft
Cervical position: Posterior

{
  "dil": "1",
  "apag": "2",
  "alt": "2",
  "cons": "2",
  "pos": "0"
}

Expected result

{
  "score": 7,
  "level": "mid"
}

Actual result

{
  "score": 7
}

Case 3

reference-003

Inputs

Dilation: 3 to 4 cm
Cervical effacement: 60 to 70%
Fetal station (De Lee): −1 or 0
Cervical consistency: Soft
Cervical position: Intermediate

{
  "dil": "2",
  "apag": "2",
  "alt": "2",
  "cons": "2",
  "pos": "1"
}

Expected result

{
  "score": 9,
  "level": "low"
}

Actual result

{
  "score": 9
}

Case 4

reference-004

Inputs

Dilation: ≥ 5 cm
Cervical effacement: ≥ 80%
Fetal station (De Lee): +1 or +2
Cervical consistency: Soft
Cervical position: Anterior

{
  "dil": "3",
  "apag": "3",
  "alt": "3",
  "cons": "2",
  "pos": "2"
}

Expected result

{
  "score": 13,
  "level": "low"
}

Actual result

{
  "score": 13
}

Code and reproducibility

This tool’s code on GitHub

Download code and tests

Sources, version and reproduction instructions

README

Local installation

Code license: Apache-2.0

Guidelines and conditions

This repository’s license applies to the code. Third-party instruments, questionnaires, data and models remain subject to their owners’ conditions.

The code tests are technical checks. Clinical approval and professional translation review are recorded separately.

Relationship with cancer research

General context — relationship to be defined

A resource for general clinical contexts. This edition does not assign a specific oncological relationship; selecting it for a study requires a justified question, population and purpose.