Fern test

Fern test refers to detection of a characteristic 'fern like' pattern of cervical mucus when a specimen of cervical mucus is allowed to dry on a glass slide and is viewed under a low power microscope. The fern test is used to provide evidence of the presence of amniotic fluid and is used in obstetrics to detect rupture of membranes and onset of labor. It also may provide indirect evidence of ovulation and fertility, however this test does not predict the time of ovulation.