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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What does cervical length of 4.8cm from ultrasound during 30th week of pregnancy suggest?

Doctor,i'm Remya,28 yrs nd this is my 1st pregnancy.nw 'm 30 weeks.evrythng was normal until 21st week.cervical length in us scan shows 3.5. But after a week i feel pain in the pelvic area and doctor suggested an immidiate circlage as my CL reduced to 1 cm .this was a manual check up.she told me that it was difficult to put d stitch as it is too short and suggestd cmplete bed rest. After a month i had an us scan and CL is 4.8 cm.3.5-aftr one week 1cm-aftr one month 4.8cm. How is it possible doctor? 'm confused.
Mon, 20 Jul 2015
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OBGYN 's  Response
Cervical length after 24 weeks in pregnancy is not a good predictor of preterm delivery, it is used primarily in the first and second trimester. In the US, it is NOT standard of care to perform a cerclage in the third trimester, and an cause rupture of membranes, infection, and oher dangerous complications. In addition, a cervical length of 2.5 cm or less is usually the cut-off. Also the cervix can look short on an ultrasound if they happened to check it while you were having a contraction, and so, if checked again, it can look normal. Right not you have a 4.8 cm cervix which is totally normal. If you have no contractions and no other risk for preterm delivery (like a positive fetal fibronectin test, twins, previous preterm delivery) , there is no reason you should need to be on bedrest or be treated differently from any normal pregnancy.
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