What does a negative Fern test mean?
What does a negative Fern test mean?
Negative: No crystallization seen (membranes are not ruptured) Positive: Crystallization seen (membranes are ruptured)
What does a positive ferning test mean?
The proteins and saline content of amniotic fluid crystallize on a slide when dry yielding the appearance of ferns. A positive test shows the presence of fern-like patterns characteristic of amniotic fluid crystals.
What does ferning mean in pregnancy?
When high levels of estrogen are present, such as just before ovulation (or during pregnancy), the cervical mucus forms fern-like patterns due to crystallization of sodium chloride on mucus fibers. This pattern is known as arborization or ‘ferning’.
Can a fern test be wrong?
Nitrazine test may also lead to false positive or negative results due to probable contamination by alkaline urine, semen, blood, meconium, vaginitis, cervicitis and using antibiotics. Fern test has also 13-30% false negative and 5-30% false positive results (13, 14).
How accurate is Ferning test?
Results: Salivary ferning test by KNOWHEN ovulation microscope is accurate method of detecting ovulation. Its accuracy was 86.5%. Conclusions: Salivary ferning test is a reliable test to detect fertile period of menstrual cycle.
What causes a false positive fern test?
Well-estrogenized cervical mucus or a fingerprint on the microscope slide may cause a false-positive fern test; false negatives can be due to inadequate amniotic fluid on the swab or heavy contamination with vaginal discharge or blood.
What causes false positive fern test?
How accurate is Ferning test for amniotic fluid?
yes. The presence of arborized crys- tals (ferning) in amniotic fluid is both sensitive (74%-100%) and specific (77%-100%) for diagnosing rupture of membranes in laboring women who re- port loss of fluid (strength of recommenda- tion [SOR]: A, multiple prospective cohort studies).
What can cause false positive fern test?
When is Fern test done?
PRINCIPLE: The fern test is used to aid the physician in the diagnosis of ruptured membranes by detecting the presence of amniotic fluid. This fluid, when placed on a glass slide, is allowed to dry.
What does pregnancy Ferning look like?
For decades, scientists have known that if a woman’s saliva forms a telltale “ferning” pattern – a bit like frost crystals under the microscope – it is the time of month when she is most likely to get pregnant.
Does KY jelly affect AmniSure?
INTERFERING SUBSTANCES: Vaginal infections or urine do not interfere with the results of the AmniSure test. The performance of AmniSure has not been established in the presence of the following contaminants: meconium, anti-fungal creams or suppositories, K-Y Jelly, Baby Powder (Starch and Talc), Replens, and Baby Oil.
What does a positive fern test mean?
(October 2016) Positive 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.
How do you test for ferns with nitrazine?
Collect specimen for nitrazine and fern tests. Spread the collected fluid that adheres to the swab over microscope slide and nitrazine paper. Apply a thin layer to the microscope slide for best results. Allow slide to air dry (do not apply coverslip).
How accurate are ferning and nitrazine tests for amniotic fluid detection?
Most studies investigating the usefulness of ferning and nitrazine methods for detecting the presence of amniotic fluid following ruptured amniotic membranes have employed samples from vaginal pooling. Reported accuracies are 84 to 100% for the ferning test and 87 to 97% for the nitrazine test. Our …
What can cause a false positive amniotic fluid test?
•”Ferning” is not specific for amniotic fluid. Other fluids (e.g., blood cervical mucus, semen and some urine specimens) when dried can also yield microscopic crystallizations in a “fern” pattern, and cause false positives. •Prolonged rupture of membranes (greater than 24 hours) or slow, minimal leaks can yield false negative results.