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Positive fern test with amniotic fluid as seen under the microscope. The fern test is a medical laboratory test used in obstetrics and gynecology.The name refers to the detection of a characteristic "fern like" pattern of vaginal secretions when a specimen is allowed to dry on a glass slide and is viewed under a low-power microscope.
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Fern test: A sterile cotton swab is used to collect fluid from the vagina and place it on a microscope slide. After drying, amniotic fluid will form a crystallization pattern called arborization [11] which resembles leaves of a fern plant when viewed under a microscope. [8] Fibronectin and alpha-fetoprotein blood tests
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Nitrazine paper test; Fern test; Amniotic fluid index; For results to be roughly 90% accurate in infection detection, a combination of both an arborization test and nitrazine paper test may be used. [11] An arborization test assesses the patient's vaginal secretions, while a nitrazone paper test uses the nitrazine paper to examines vaginal pH.
While the specificity and positive predictive value are poor, fetal fibronectin testing has excellent sensitivity (100%) and negative predictive value (100%). Therefore, a negative fFN test is a very strong indicator that preterm birth is not likely to occur within the next 7 days. [5]
Lichtenberg figures are fern-like patterns that may appear on the skin of lightning strike victims and typically disappear in 24 hours. [10] They are also known as Keraunographic markings. [11] A lightning strike can also create a large Lichtenberg figure in grass surrounding the point struck.
The quellung reaction, also called the Neufeld reaction, is a biochemical reaction in which antibodies bind to the bacterial capsule of Streptococcus pneumoniae, Klebsiella pneumoniae, Neisseria meningitidis, Bacillus anthracis, Haemophilus influenzae, [1] Escherichia coli, and Salmonella.