fFN (Fetal Fibronectin) Test

What a Negative Test Result Means

A negative test result means you have a less than 1% chance of giving birth in the next two weeks,1 which can give you peace of mind and can help you avoid unnecessary drug treatment, bed rest, and hospitalization. This knowledge can provide reassurance so you can get on with your current activities without worry and you don't need to cancel plans unnecessarily.

  • The vast majority of women will get a negative test result, indicating that no fetal fibronectin is "leaking" into the vagina
  • A negative test result gives you 99.2% assurance that you will not deliver in the next two weeks1

What you can do next

After the test, if you still have symptoms or concerns, talk to your doctor — the test can be repeated as often as every two weeks from weeks 22 to 35 of your pregnancy. Also, be sure that you know the symptoms of premature labor and what to watch for.


  • 1. Peaceman AM, Andrews WW, Thorp JM, et al. Fetal fibronectin as a predictor of preterm birth in patients with symptoms: A multicenter trial. Am J Obstet Gynecol. 1997;177:13-18.

What Are the Experts Saying?


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