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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.
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
The mucus is aspirated from cervical canal and spread on a glass slide. Smear from posterior fornix is used as control. 10-50 motile sperms per high power field are considered normal. Rotatory or shaky motion of sperms indicates presence of antispermal antibody. Cervical mucus is examined for quality, viscosity and fern test. [1]
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.
A false positive fetal fibronectin result can occur if the test is performed after digital examination of the cervix or after having had intercourse. It is important that the swab be taken before a digital cervical examination or more than 24 hours following intercourse or previous examination. [8]
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Because pH in the upper vagina is normally acidic (pH 3.8–4.5), a vaginal pH test showing a pH of more than 4.5 strengthens a suspicion of rupture of membranes in case of clear vaginal discharge in pregnancy. [7] Other tests for detecting amniotic fluid mainly include nitrazine paper test and fern test. [8]
After ovulation, the character of cervical mucus changes, and under the influence of progesterone it becomes thick, scant, and tacky. Sperm typically cannot penetrate it. [citation needed] Saliva does not always exhibit spinnbarkeit, but it can under certain circumstances. The thickness and spinnbarkeit of nasal mucus are factors in whether or ...