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A false negative error, or false negative, is a test result which wrongly indicates that a condition does not hold. For example, when a pregnancy test indicates a woman is not pregnant, but she is, or when a person guilty of a crime is acquitted, these are false negatives.
False negative readings can occur when testing is done too early. hCG levels rise rapidly in early pregnancy and the chances of false negative test results diminish with time (increasing gestational age). [23] Less sensitive urine tests and qualitative blood tests may not detect pregnancy until three or four days after implantation. [24]
If you take a test in the afternoon or evening, you won’t necessarily get incorrect results, but there may be a higher risk of a false negative if you’re still early on in your pregnancy, Dr ...
Fetal fibronectin. Fetal fibronectin (fFN) is a fibronectin protein produced by fetal cells. It is found at the interface of the chorion and the decidua (between the fetal sac and the uterine lining ). Fetal fibronectin is found normally in vaginal fluid in early pregnancy prior to 22 weeks due to normal growth and development of tissues at the ...
A pregnancy test detects the presence of the pregnancy hormone human chorionic gonadotropin, or hCG, in a person’s body. But the body doesn’t produce that hormone until several days after ...
False pregnancy (or pseudocyesis, from the Greek pseudes "false" and kyesis "pregnancy") [ 1] is the appearance of clinical or subclinical signs and symptoms associated with pregnancy although the individual is not physically carrying a fetus. [ 2] The mistaken impression that one is pregnant includes signs and symptoms such as tender breasts ...
The CST is used for its high negative predictive value. A negative result is highly predictive of fetal wellbeing and tolerance of labor. The test has a poor positive predictive value with false-positive results in as many as 30% of cases. [4] [5] A positive CST indicates high risk of fetal death due to hypoxia [3] and is a contraindication to ...
ICD-9-CM. 75.34. A nonstress test ( NST) is a screening test used in pregnancy to assess fetal status by means of the fetal heart rate and its responsiveness. A cardiotocograph is used to monitor the fetal heart rate and presence or absence of uterine contractions. The test is typically termed "reactive" (also "reassuring") or "nonreactive ...
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