Nivin Todd, MD, FACOG
Who Gets the Test?
The fetal fibronectin test isn't necessary for all pregnant women. Your doctor may suggest it if you're at risk of going into labor early. You may be at higher risk because you're bleeding, have a health problem, have early contractions, or delivered a baby early in the past.
What the Test Does
Fibronectin is a protein that connects the amniotic sac to your uterus -- almost like glue. As the sac begins to separate before birth, your body releases the excess fibronectin.
The test checks the level of fibronectin in your cervix. High levels can mean that you’re about to go into labor.
How the Test Is Done
The test is simple and safe. Your doctor will take a quick swab from your cervix. It may be uncomfortable, but it will be quick. Don't have intercourse for 24 hours before the test -- it could cause a false positive.
What to Know About Test Results
You should hear the results the next day. Low levels of fetal fibronectin rule out the possibility of labor within the next week or so.
High levels don't necessarily mean that you are going into labor. They just indicate you're at higher risk. Your doctor may want to do more tests, such as ultrasounds. You may need drugs to slow down labor. Your baby may need medication to strengthen the lungs.
How Often the Test Is Done During Pregnancy
It depends on your situation. Talk to your doctor.
Tests Similar to This One
Cervical length measurement