Bishop Score Calculator
Bishop Score (also known as
Pelvic Score) is the most commonly used method to rate the readiness of the
cervix for induction of labor. The Bishop Score gives points to 5
measurements of the
pelvic examination dilation, effacement of the cervix, station of the fetus,
consistency of the cervix, and position of the cervix. The calculator
below will calculate a Bishop score
The Bishop’s score was originally developed to predict the
likelihood of a woman entering labor naturally in the
near future. A woman with a low score of 1 would not expected go into
labor for about 3 weeks. A
woman with a higher score score of 10 could be expected to go into
labor within a few days.
Although the Bishop’s score was originally used to evaluate the likelihood of
vaginal delivery in women who have given birth before (multiparous)
it is also now used for women who have never given birth (nulliparous)
who are being considered for induction of labor.
If the Bishop score is 8 or greater the chances of
having a vaginal delivery are good and the cervix is said to be favorable or
"ripe" for induction. If the Bishop score is 6 or less the chances
of having a vaginal delivery are low and the cervix is said to be unfavorable
or "unripe" for induction.
A simplified Bishop score using only dilation, station and
effacement may be as predictive of successful induction as the original
full Bishop score. A simplified Bishop score of 5 had a similar predictive
value of having a successful vaginal delivery as an original Bishop score
of greater than 8.
How The Points Are Assigned
The most important element of the Bishop score is dilatation. Dilatation is the
distance the cervix is opened measured in centimeters (cm) . For reference a penny is about 2
cm across. Points are given from 0 to a maximum of
3 points for a cervix dilated to 6 cm or greater.
Effacement (also called shortening or thinning) is reported as a percentage from zero percent
(normal length cervix) to 100% or complete (paper thin cervix). Points are given from 0 to a maximum of
3 points for a cervix effaced to 80 % or greater.
Image credit: National Institutes of Health 2011.
Station is the position of the baby's head relative to the bony projections
of the lower pelvis called the ischial spines. When the baby's head
is at 0 station its head is even with the ischial spines. Stations divides the pelvis above and below the ischial spines into 3rds
Negative numbers indicate that the head is
above the ischial spines. Positive numbers indicate its head is below the
Points are given from 0 to a maximum of 3
points for a station of 1 + or 2+.
(c) LifeART / www.fotosearch.com Stock Photography
In 1988, the American College of Obstetricians and Gynecologists redefined station
as the level of the leading bony point
of the fetal head at or below the level of the maternal
ischial spines measured in centimeters (0–5 cm).
The texture of the cervix on examination.
Firm : The cervix feels hard and rubbery .
Medium: The cervix feels compressible but not soft
Soft : The cervix feels mushy
The position of the cervix relative to the fetal head and
Reviewed by Mark Curran, M.D. FACOG
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