FAQs About Fetal Fibronectin Testing

Fetal fibronectin testing is a safe, simple and non-invasive test that can help you and your doctor determine if your body may be preparing to give birth early. This knowledge can ensure the right care is provided for you and your baby.

What is a fetal fibronectin test?

An fFN test is a safe, simple and non-invasive test that measures whether fetal fibronectin is leaking from your uterus. Fetal fibronectin is a “glue-like” protein your body produces to help hold your baby in place.1 A positive test result could indicate that your body is preparing to give birth. A negative test result can give you reassurance that your chances are less than 1% of giving birth in the next 2 weeks.2,3

Why is knowing my test result important?

A negative test result can give you great peace of mind. 99.2% of women with symptoms of preterm birth who have a negative fetal fibronectin test result will not deliver their baby within the next 14 days.2,3

A small percentage of women who get the test will get a positive result, indicating that the body is “leaking” fetal fibronectin. This means that you are at higher risk of early delivery and your doctor can determine the most appropriate treatment plan.

It is important to note that not everyone with a positive test result delivers early.

Where do I get a fetal fibronectin test?

An fFN test is given by your doctor or midwife in hospital.

How is the fetal fibronectin test performed?

A fFN test is typically performed as a simple vaginal swab by a doctor or midwife at a hospital. Analysis of the sample takes approximately 10 minutes.

Are there any side effects with a fetal fibronectin test?

There are no known related side effects for you or your baby.

Can I get tested more than once?

Yes. Your doctor can decide to repeat the test as often as every 2 weeks during the period from weeks 22 to 36 of gestation.2,3


  1. Lockwood CJ, Kuczynski E. Risk stratification and pathological mechanisms in preterm delivery. Paediatr Perinat Epidemiol. 2001;15(suppl 2):78-89.
  2. 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
  3. Rapid fFN for the TliIQ System [package insert]. AW-04196-002, Rev. 003. Marlborough, MA: Hologic, Inc.; 2015

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