Cervical Bishop score

The Bishop score for cervical examination is a rating standard for examining the maturity of the cervix. Generally speaking, the full score is 13 points. By examining the maturity of the cervix, it can be determined whether a woman can choose a natural birth, and when she will choose a natural birth. It is best for modern pregnant women to do this score test before delivery, so that they can be more conducive to choosing a natural birth. So what is the reason for the Bishop score in cervical examination?

The Bishop score is used to distinguish the cervical maturity, estimate the actual effect of artificial rupture of membranes in reducing the delivery process, and estimate the success rate of trial production. The full score is 13 points. Check the maturity of the cervix in late pregnancy. The cervical maturity score can estimate the time before delivery and whether natural delivery is possible. Prenatal cervical ripening score can estimate the success rate of natural delivery.

The maximum score of the Bishop scoring method is 13 points. The higher the score, the higher the success rate of trial delivery. The lower the score, the lower the success rate of natural delivery. If the pregnant woman's score is ≤ 3 points, it means that the artificial rupture of membranes is unsuccessful and other methods of delivery should be used. If the score is 4 to 6, the pass rate reaches 50%, and cervical perfection can be promoted. The trial production pass rate for scores between 7 and 9 was 80%, and all the trial productions with scores above 9 were successful.

The indicators of Bishop's cervical maturity scoring method mainly include cervical dilation, cervical effacement, presenting part, cervical strength and cervical position.

1. Enlargement of the cervical opening

The enlargement of the cervical opening is called dilation of the cervix, also known as cervical dilation. When a pregnant woman is about to give birth, her uterus contracts regularly, and the amniotic fluid sac becomes wedge-shaped in front of the baby's presenting part, causing the internal opening of the cervix to expand upward and outward. The external cervical opening of a primipara is usually only the size of a fingertip, and a primipara can accommodate one finger. As the labor progresses, the external cervical os expands to a diameter of 10 cm, allowing the full-term fetal head to pass through. This process is called cervical dilation. If the cervical os is enlarged to 0 cm, 0 points are given; if it is 1 to 2 cm, 1 point is given; if it is 3 to 4 cm, 2 points are given; and if it is ≥5 cm, 3 points are given.

2. Effacement of the cervical canal

The length of the cervix during labor is 2~3cm, and is slightly longer in primiparas. The regular uterine contractions before and after delivery stretch the uterine muscles and surrounding tendons of the cervix, as well as the amniotic sac in front of the presenting part, causing the cervical canal to gradually shorten until it disappears. In primiparas, the cervix usually effaces first and the cervix dilates later; in primiparas, the cervix effaces and the cervix dilates at the same time. When the cervical canal disappears by 0-30%, 0 points are awarded; when it disappears by 40-50%, 1 point is awarded; when it disappears by 60-70%, 2 points are awarded; when it disappears by more than 80%, 3 points are awarded.