The fetal Fibronectin (fFN) Test Cassette (Vaginal secretion) is a based on fluorescence immunoassay for the quantitative detection of fFN in human vaginal secretions during pregnancy, which is a special protein that literally holds baby in place in the womb. The test is intended for professional use to help diagnose if the preterm delivery is likely to occur in pregnant women. The test may be run on patients between 24 and 34 weeks gestation.