How accurate is Ferning test for amniotic fluid?
The diagnosis of rupture of the membranes by traditional methods of nitrazine paper determination and fern crystallization has been reported to be 93-98% accurate. Although the presence of contaminants in amniotic fluid has been reported to reduce this accuracy, the literature is conflicting concerning these effects.
What is amniotic fluid Ferning?
The arborization pattern found when a drop of amniotic fluid is allowed to air dry on a microscope slide, known as ferning.
How is Ferning test done?
In this test, you get a small microscope with built-in or removable slides. You put some of your saliva on a glass slide, allow it to dry, and look at the pattern it makes. You will see dots and circles, a fern (full or partial), or a combination depending on where you are in your monthly cycle.
What does a fern test confirm?
The fern test is most commonly used to provide evidence of the presence of amniotic fluid and is used in obstetrics to detect preterm premature rupture of membranes and/or the onset of labor.
Can a fern test be wrong?
Fern test has also 13-30% false negative and 5-30% false positive results (13, 14). “Several studies have been conducted to find a definite, easy, noninvasive and reliable diagnostic test for PROM in recent years” (18). These studies have mainly focused on biochemical agents with high concentration in amniotic fluid.
What is a negative fern test?
Negative: No crystallization seen (membranes are not ruptured) Positive: Crystallization seen (membranes are ruptured)
What is Fern phenomenon?
Abstract. In 1945 Papanicolaou1 discovered the interesting phenomenon that cervical mucus spread on a slide and left to dry crystallized with “arborization,” a fern- or palm leaf-like reaction. He considered this phenomenon chracteristic of the time of ovulation.
What causes Ferning of amniotic fluid?
4. If present, the amniotic fluid crystallizes to form a fern-like pattern due to the relative concentrations of sodium chloride, proteins, and carbohydrates in the fluid.
What is fern test in analyzing mucus?
Abstract. Background: The fern test is a method for assessing the characteristics of the nasal section in the treatment of patients with mucous dysfunction of the airway.
What does a negative fern test mean?
No crystallization seen
Negative: No crystallization seen (membranes are not ruptured) Positive: Crystallization seen (membranes are ruptured)
Can amniotic fluid tests be wrong?
False negative tests results can occur when leaking is intermittent or the amniotic fluid is diluted by other vaginal fluids. False positive results can be due to the presence of alkaline fluids in the vagina, such as blood, seminal fluid, soap, or some infections.
What causes amniotic fluid to Fern?