PREGNANCY-BIRTH Messages for December, 2000: Re: 31 weeks and positive fetal fibronectin

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Re: 31 weeks and positive fetal fibronectin

From: Lynn D. Montgomery, MD (anonymous@obgyn.net)
Wed, 20 Dec 2000 22:51:12 -0600 (CST)

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In reply to: Tara: "31 weeks and positive fetal fibronectin"

At Wed, 20 Dec 2000, Tara wrote: >
>I was diliated 1 cm and 50% effaced at my 29 week appointment. I had
>some contractions and was given a fetal fibronectin test that came back
>positive. I am on complete bed rest with bathroom privelages only and I
>take brethine 5 mg every 8 hours. My question is what are the rates of
>going into preterm labor with a positive fetal fibronectin? I mean if it
>comes back positive is there a given amount of weeks you will deliver
>by? What is the accuracy rate on these test. I am not due until Feb 18,
>2001. So I am now 31 weeks and 3 days. Any information on the test
>itself would be greatly appreciated.
>
>Thank you

The accuracy of predicting preterm labor resulting in preterm birth of a fetal fibronectin test is only about 45%. Further, given the fact that you are 1cm/50%, I could have told you that your fetal fibronectin test would be positive and you could have sent me the $250. When there is significant cervical change associated with contractions, the fibronectin is GOING to be positive. The efficacy of the test is only two weeks as well. Don't let then do another one. The fact that your cervix is 1cm/50% indicates that you are certainly at risk for preterm birth, but to give percentages at this stage is very hard. I certainly would agree with the bedrest... Lynn

--
Lynn D. Montgomery, MD
Director, Maternal-Fetal Medicine
Rocky Mountain Perinatal Center
Missoula, Montana

**Note:  Opinions expressed here are for educational purposes only and, as such, do not constitute a physician-patient relationship.  This information is not intended to supplant the need for you to consult with your physician prior to choosing therapeutic options and/or interventions.

**Private e-mails cannot be entertained due to time constraints, consequently no private e-mails will receive a response.

**Thank you for your understanding ;-)

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In reply to: Tara: "31 weeks and positive fetal fibronectin"

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