In vitro studies evaluated ferning in samples of amniotic fluid mixed with blood, meconium, or vaginal fluids. Blood contamination didn’t affect ferning unless the sample contained more than 10% blood. 3 - 5 Meconium (which itself verifies ruptured membranes) didn’t change the fern pattern at any dilution, 6 nor did vaginal discharge. 3. These images are a random sampling from a Bing search on the term "Vaginal Fluid Ferning." Click on the image (or right click) to open the source website in a new browser window. Search Bing for all related images. Related Studies (from Trip Database) Open in New Window.
Technique Obtain fluid for exam (usually after Vaginal Pooling). Place sample on glass slide. Allow sample to air dry for 10 minutes. /fern·ing/ (fern´ing) the appearance of a fernlike pattern in a dried specimen of cervical mucus or vaginal fluid, an indication of the presence of estrogen. fern·ing. Pattern of arborization produced by a thin film of cervical mucus, secreted at midcycle, on drying, which somewhat resembles a fern or a palm leaf. ferning.
affect ferning In vitro studies evaluated ferning in samples of amniotic fluid mixed with blood, meconi-um, or vaginal fluids. Blood contamination didn’t affect ferning unless the sample con-tained more than 10% blood.3-5 Meconium (which itself verifies ruptured membranes) didn’t change the fern . • Insert vaginal speculum into the patient’s vagina. • Using a sterile cotton swab, collect a sample of fluid from the vaginal fornix. –Avoid the cervix as cervical mucus will yield false positive results.
Ferning: The fern test can identify, via microscopy, the presence of sodium chloride in the vaginal fluid — often a sign of PROM or pPROM. However, fern testing requires both an invasive speculum exam to collect a sample, and a powerful microscope to analyze it. In pregnant women, premature rupture of membranes (PROM) occurs when the amniotic sac that surrounds the baby (the membrane) breaks before the start of labor. It is more commonly referred to as “when your water breaks.” Membrane rupture that occurs before the 37th week of a pregnancy is called preterm PROM (PPROM).