Cervix Length at Mid-Pregnancy May Predict C-Section Risk

Finding won't change practice, but could help illuminate labor process, experts say

By Serena Gordon
HealthDay Reporter

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WEDNESDAY, March 26 (HealthDay News) -- The length of a woman's cervix at mid-pregnancy may indicate her risk of needing a Caesarean birth, a new study suggests.

"Women having their first baby who have a long cervix around 23 weeks of pregnancy are more likely to be delivered by emergency Caesarean section during labor at term," the study's lead author, Dr. Gordon Smith, head of obstetrics and gynecology at Cambridge University in the United Kingdom, said in a prepared statement.

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"The nature of this finding is not such that women should now have this measurement performed to predict Caesarean section risk," he added. "The key issue in this analysis is understanding the processes that lead to normal and abnormal labor."

Several experts said that doctors won't be measuring your cervix halfway through your pregnancy to predict whether or not you'll have a natural birth any time soon.

"If the cervix hasn't prepped itself for labor, there's something going on," said Dr. Miriam Greene, an obstetrician at New York University Medical Center. "The idea that a longer cervix leads to a greater risk of Caesarean makes sense. The question is, if I start checking at 23 weeks and find a longer cervix, what then?"

Dr. Robert Lorenz, director of maternal-fetal medicine at Beaumont Hospital in Royal Oak, Mich., echoed Greene's sentiment. "This is a very interesting study that gives us another perspective on what happens in labor, but I don't think it has any immediate clinical applications," he said. Even years from now, he added, he's not sure anyone would intervene at 23 weeks, because "anything you do to change the cervix at 23 weeks might bring on preterm birth."

But both Greene and Lorenz said the new study was impressive because of the large numbers of women included, and because it adds to scientists' understanding of what happens to a woman's body during pregnancy and delivery.

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