Interpreting Positive Test Results
In managing symptomatic patients, a positive fetal fibronectin test result can be a helpful indicator to increase confidence in intervention. Even if these patients do not deliver within 2 weeks, they are significantly more likely to deliver before 37 weeks than patients who have a negative fFN test.
| 7 days = 12.7% |
| 14 days = 16.7% |
| < 37 weeks gestation = 44.7% |
- Identification of patients who can most likely benefit from intervention
- Opportunity for antenatal steroids
- Preparation for optimal neonatal care
How many patients must be treated with corticosteroids to prevent one case of Respiratory Distress Syndrome?4
| fFN Testing: Positive 17 |
| No fFN Testing: 109 |
| fFN Testing: Negative 509 |
References
- Rapid fFN for the TLIIQ System [package insert]. AW-04196-002, Rev. 003. Marlborough, MA: Hologic, Inc.; 2015.
- 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.
- Antenatal corticosteroid therapy for fetal maturation. Committee Opinion No. 713. American College of Obstetricians and Gynecologists.
Obstet Gynecol 2017;130:e102–9. -
Adapted from: Honest H, et al. Accuracy of cervicovaginal fetal fibronectin test in predicting risk of spontaneous preterm birth: systematic review. BMJ. 2002;325:301. doi:10.1136/bmj.325.7359.301.
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