Bishop score

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Bishop score, also Bishop's score, is a pre-labour scoring system to assist in predicting whether induction of labour will be required.[1]

Components

The total score is achieved by assessing the following five components on vaginal examination:

  • Cervical dilatation
  • Cervical effacement
  • Cervical consistency
  • Cervical position
  • Fetal station

They can be remembered with the mnemonic: Call PEDS For Parturition = Cervical Postion, Effacement, Dilation, Softness; Fetal Station.

Scoring

Each components is given a score of 0-2 or 0-3. The highest possible score is 13.

Bishop score
Parameter\Score 0 1 2 3
Position Posterior Intermediate Anterior -
Consistency Firm Intermediate Soft -
Effacement 0-30% 40-50% 60-70% 80%
Dilation <1 cm 1-2 cm 2-4 cm >4 cm
Fetal station -3 -2 -1, 0 +1, +2

Interpretation

A score of 5 or less suggests that labour is unlikely to start without induction. A score of 9 or more indicates that labour will most likely commence spontaneously.[2]

A low Bishop's score often indicates that induction is unlikely to be successful[3]. Some sources indicate that only a score of 8 or greater is reliably predictive of a successful induction.

Modified Bishop score

According to the Modified Bishop's pre-induction cervical scoring system, effacement has been replaced by cervical length in cm, with scores as follows- 0>3cm, 1>2cm, 2>1cm, 3>0cm.[4]


References

  1. Bishop EH. 1964. Pelvic scoring for elective induction. Obstetrics and Gynecology 24:266.
  2. Tenore J (2003). "Methods for cervical ripening and induction of labor". Am Fam Physician. 67 (10): 2123–8. PMID 12776961. (Incomplete) Free Text.
  3. http://cat.inist.fr/?aModele=afficheN&cpsidt=2381313
  4. Dutta DC. Text Book of Obstetrics. 6ed. New Central Book Agency. 2001. ISBN 978-8173811425.

See also


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