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Topic: False negative

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	How common is a false negative pregnancy test and what causes it?
		A false negative result is when the test says you are not pregnant but you are.
		One reason for a false negative pregnancy test could be that you took the test too early.
		A negative result can mean that you are not pregnant, you took the test too early or you took the test wrong.
	www.babyhopes.com /articles/falsenegative.html (726 words)

	Strategies to Reduce False Positives and False Negatives in NIDS
		The term false positive is a broad and somewhat vague term that describes a situation in which an NIDS device trigger an alarm in a when there is malicious activity or attack occurring.
		False alarm is the better term to describe this behavior since "false positive" gives the impression that IDS technology itself is fundamentally flawed and benign trigger gives the impression that there is no possibility for a true false positive to exist.
		False negative is the term used to describe a network intrusion device's inability to detect true security events under certain circumstances.
	www.securityfocus.com /infocus/1463 (1926 words)

	False negative (Site not responding. Last check: )
		A test result in which the test is negative (for example, a pregnancy test finds no sign of pregnancy) but the event is actually there (the woman is pregnant) also called a 'miss'.
		For instance, mammography screening has a false negative rate of 5 to 20% depending on age, that is, 5 to 20% of women with breast cancer receive a negative test result.
		The false negative rate and the false positive rate are dependent: to decrease one is to increase the other.
	www.jr2.ox.ac.uk /bandolier/booth/glossary/falseneg.html (123 words)

	s020506a - HIV ELISA Test - False Negative Results
		False negative anti-HIV-1/HIV-2 ELISAs in acute HIV-2 infection.
		In a total of 13 104 tests there were eight false negative results attributable to assay insensitivity: three were on two serum samples collected close to seroconverison and five on another serum specimen.
		This false negativity rate indicates that all of the assays performed adequately and leads to an estimate of one false negative result in a thousand tests in routine diagnostic practice.
	www.emory.edu /WHSCL/grady/amreport/litsrch01/s020506a.html (1639 words)

	False Response Monitoring During Automated Perimetry
		The effect that false responses have on field data is the subject of a fellow paper.
		False positives were only injected if the subject did not respond to the stimulus and false negatives were only injected if the subject did respond to the stimulus.
		False positives were only injected when the subject registered 'not seen' responses and false negatives were only injected when 'seen' responses were registered.
	research.opt.indiana.edu /library/ResponseMonitoring/ResponseMonitoring.html (3907 words)

	False positive/negative
		False positive and false negative results either cause unwarranted concern or unwarranted relief, and they can lead to additional expense...as do true positive and true negative tests.
		Some researchers ignorantly or shrewdly and intentionally design "performance test studies" of rates of false positivity and false negativity in order to get a grant ($) and without being SURE that the factors are clear as to applicability to real-word practice situations or not.
		Old Aunt Jane partly missed her husband's neck with her lipstick-kiss and hit his collar...a case of a false-positive finding (which was positive for female kiss but negative for infidelity...wife "walked the line" of possibilities of the significance...the interpretation...of the finding and got to the truth of it).
	poptop.hypermart.net /falseposneg.html (1144 words)

	Early Pregnancy Tests and Ovulation Predictor Kits: FAQ
		Moreover, A percentage of "false positive" pregnancy tests can be attributed to misinterpretation of results due to a failure to follow test instructions with precision.
		A percentage of "false positive" pregnancy tests can be attributed to misinterpretation of results due to a failure to follow test instructions with precision.
		False negative results are more common than false positives - and are primarily due to inaccuracies in timing of the test or carelessness in the test procedure itself.
	www.early-pregnancy-tests.com /faq.html (2063 words)

	What are false negatives and false positives and why are they so important? [POPFile Documentation Project]
		But this also means that the definition of a false positive and of a false negative cannot be built around the simple question of spam versus ham.
		Suppose POPFile categorizes a message as belonging to bucket A, while it really belongs to bucket B. From the point of view of bucket A, we have a false positive because the mail was falsely tagged as belonging to bucket A. From the point of view of bucket B, we have a false negative.
		False positives and false negatives become vitally important only in relation to spam filtering.
	popfile.sourceforge.net /wiki/faq:FalseNegativePostive (431 words)

	Bird Flu False Negative for Second Nurse in Thai Binh?
		Additional tests on the nurse at Thai Binh is warranted in view of her relationship to four other H5N1 confirmed cases, and the history of false negative or inconclusive results of patients in clusters in Thai Binh.
		False negatives have also been reported for patients in southern Vietnam.
		The nurse's history of contacts with co-workers and patients raises the suspicion level and suggests that her bird flu symptoms are due to influenza A. If the infection is due to a recombinant or reassortant, then the virus may not be detected with the standard H5N1 reagents.
	www.recombinomics.com /News/03130503/H5N1_Nurse_False_Negative.html (478 words)

	FurBuy - Furry Electronic Auctions
		Negative feedback should only be left in the event that the binding transaction either was not completed or there was intentional misleading of the quality, price or condition of an item.
		If negative feedback is indeed justified, the user it is left for may be reviewed and action may be taken by the admins, up to and including suspension or removal from the system.
		If negative feedback has been left for you and you feel it is unjustified, you may appeal the feedback to an administrator for additional review.
	www.furbuy.com /docs/faqs.shtml (14006 words)

	What is a false negative? [POPFile Documentation Project] (Site not responding. Last check: )
		A false negative is the little kid brother of a false positive.
		False negatives may be irksome, but false positives can be dangerous.
		In the event that an email is incorrectly classified, there will be a false positive reported for the bucket it was initially placed in AND a false negative reported for the bucket that you reclassify the message into.
	popfile.sourceforge.net /wiki/Glossary:FalseNegative (128 words)

	Be positive it's negative - Health - www.smh.com.au
		There are biological false positives where a medical condition other than that being tested for interferes with the result.
		On the flip side, there are also false negative results: where a patient tests negative but really does have the condition being tested for.
		A false positive result may leave someone convinced that he or she has a terrible, possibly life-threatening, disease.
	www.smh.com.au /news/Health/Be-positive-its-negative/2005/04/21/1114028458218.html?from=moreStories (900 words)

	Find false negative Experts and false negative Expert Witnesses at www.findexperts.com. (Site not responding. Last check: )
		Available to be False Negative expert witnesses and provide False Negative forensic consulting in False Negative litigation, in addition prepare False Negative expert witness reports for use in deposition and/or in-court trial testimony.
		Find False Negative experts and witnesses in the CANCER - COLON category." title="Cancer that begins in the colon is called colon cancer, and cancer that begins in the rectum is called rectal cancer.
		It is the most creative and exhausting counseling that a public relations and public affairs professional would be asked to perform as he turns a negative into a positive.
	www.findexperts.com /srch/experts/witnesses/False-negative.htm (2684 words)

	Andhra Pradesh Counselors Project
		This is known as a false positive, and because of this all results must be confirmed by another test method.
		The likelihood of a false negative test result must be discussed with the clients if their history suggests that they have engaged in behaviour, which was likely to put them at risk of HIV infection.
		The most frequent reason that a false negative test result has been obtained is that the individual is newly infected and has not yet produced detectable HIV antibodies.
	www.aidscounselling.in /hiv_aids_testing.htm (1410 words)

	vgn-ext-hidden_Abstract
		The purpose of this study is to determine the effect on false negative rates if patients with micrometastatic disease (<0.2mm) in SLN biopsies were reclassified...
		The purpose of this study is to determine the effect on false negative rates if patients with micrometastatic disease (<0.2mm) in SLN biopsies were reclassified as node negative.
		There were 2 false negative SLNs producing a total of 96 (47%) node positive patients and a false negative rate of 2.1% (2/96).
	www.plwc.org /portal/site/ASCO/menuitem.34d60f5624ba07fd506fe310ee37a01d/?vgnextoid=76f8201eb61a7010VgnVCM100000ed730ad1RCRD&vmview=abst_detail_view&confID=23&index=y&abstractID=102009 (580 words)

	Are there false negative tests for HIV? - AIDS - DoctorNDTV
		After the window period a negative test, even one, is definite proof that there is no HIV infection.
		False negatives are extremely uncommon in situations such as in India where overall prevalence is very low.
		However, false positive tests are quite common and therefore repeat tests should always be done before labeling a person as positive.
	www.doctorndtv.com /faq/detailfaq.asp?id=3531 (198 words)

	Journal of Statistics Education, v12n3: S. Linn
		The definitions of false positive rates and false negative rates are often unclear in a one-table presentation.
		Fleiss (1981) defined the false positive rate as the proportion of people, among those responding positive to the diagnostic test, who are actually free of the disease.
		Similarly, Fleiss (1981) defined the false negative rate as the proportion of people, among those responding negative on the test, who nevertheless have the disease.
	www.amstat.org /publications/jse/v12n3/linn.html (2840 words)

	Stats: ROC curve
		A good diagnostic test is one that has small false positive and false negative rates across a reasonable range of cut off values.
		This means that 1- the false negative rate is high and the false positive rate is low.
		This means that every improvement in false positive rate is matched by a corresponding decline in the false negative rate.
	www.childrensmercy.org /stats/ask/roc.asp (1623 words)

	Breast cancer, mammography, exam results, false negative, false positive -- RealAge Health Information
		Each such false positive test involves a 30% chance of having a sonogram (ultrasound), a 30% chance of a repeated physical exam or surgical consultation, and a 30% chance of having a biopsy.
		To lower the risk of a false positive mammogram, have the test done at a location where a board-certified radiologist is present at all times and interprets the films as soon as they are taken.
		Another way to lower the risk of a false positive mammogram is to locate a mammography facility where each film is read independently by two board-certified radiologists who limit their practice to breast imaging.
	www.realage.com /Health_Guides/BreastCancer/topics/topics.asp?topic=40&navtopic=mg&memberId=&cbr= (1097 words)

	Sensitivity
		Smears were taken from 120 women known to have cancer of the cervix and from 580 women who did not have cancer of the cervix.
		If you were to administer this test to a group that had a low prevalence rate of the disease, then the results would be very difficult and costly to determine.
		What the PV is used to determine is not the accuracy of the test, but rather the probability that the individuals testing positive or negative actually have the disease.
	www.unlv.edu /Faculty/ccochran/HCA202_2005/HCA202_2003/EPI_2002_Sensitivity03.html (668 words)

	False Negative Pregnancy Test
		A false negative pregnancy test gives you an inaccurate reading, indicating that you are not pregnant when you actually are.
		The most common cause for a false negative pregnancy test result is the amount of human chorionic gonadotropin (hCG), also known as "the pregnancy hormone", present within the urine sample.
		If you take a home pregnancy test that shows negative and you do not get your period, if you take another test at a later date that gives you a positive result, or if you feel that you are actually pregnant, see a medical professional.
	www.bluegumbohealth.com /FalseNegativePregnancyTest.aspx (314 words)

	The Body's Bulletin Boards: Any False Negative RNA PCR?
		But I really need to hear from anyone who tried to use the PCR to figure out their status and had false negative prior to tesing +.
		From my research a false negative is not all that uncommon.
		I have noticed on other sites that the PCR can be of some use, but there is a risk of false and negative and positives.
	www.thebody.com /cgi-bin/bbs/showflat.php?Cat=&Board=testpos&Number=187175&page=33&view=collapsed&sb=7&o=&vc=1 (1144 words)

	American Celiac Disease Alliance
		A false negative means that the patient actually has the disease, but the test result is negative.
		Its major drawbacks are that it may be falsely negative in young children, in patients with IgA deficiency and a lesser degree of villous atrophy, and in the hands of an inexperienced laboratory.
		One negative aspect of the TTG antibody is that it can be falsely positive in a patient who has another autoimmune condition.
	www.americanceliac.org /diagnosis.htm (1110 words)

	false negative pregnancy test
		Pregnancy Tests and False Negatives - LoveToKnow Pregnancy Receiving a false negative result on a home pregnancy test means the test result stated you are not pregnant when in fact you are pregnant.
		Negative Pregnancy Tests With Clomid How safe is clomid and false negative pregnancy tests clenbuterol nolvadex.
		False positives are rare but false negatives are a bit more common.
	www.medical-test.net /pregnancy-tests/falsenegativepregnancytest.html (533 words)

	Medical Dictionary: False negative - CureResearch.com
		Introduction: A false negative is a test result that is incorrect, with a negative result wrongly indicating you do not have a condition.
		For example, a pregnancy test saying that you are not pregnant when you are pregnant, is a false negative, because it is a "negative" result indicating you are not pregnant.
		Almost all medical tests have some risk of false positives or false negatives.
	www.cureresearch.com /medical/false_negative.htm (287 words)

	eMedicine - Screening and Diagnostic Tests : Article by Theodore Gaeta, DO, MPH (Site not responding. Last check: )
		Negative predictive value - Probability that the disease is not present when the test or procedure result is negative; calculated as follows: number of true-negative results/(number of true-negative results + false-negative results)
		The likelihood that the disease is present with a positive result, or the likelihood of its absence with a negative result, must be assessed and factored with the clinician's pretest estimate of the probability that the patient has the disease (ie, prior probability).
		Similarly, the negative predictive value is determined by identifying the probability that an individual with a negative test result is truly disease-free as follows: d/(c + d).
	www.emedicine.com /emerg/topic779.htm (3102 words)

	ASC - Quality Control and Quality Assurance Practices
		CLIA ’88 regulations specify that at least 10% of samples interpreted as negative by each cytotechnologist be re-screened by a pathologist or a qualified supervisory cytotechnologist prior to reporting. Specimens from women considered to be at increased risk for cervical cancer must be included in the review process.
		False positives are likely to occur at some level because of the difficult, subjective, interpretive character of cytologic evaluation, and due to pressures to minimize false negative results.
		The false negative proportion calculated for a laboratory represents an estimate of the staff’s average screening sensitivity. ; If sampling false negatives are added to the laboratory FNP, the overall false negative rate of cervical cytology may approach 20% or higher.
	www.cytopathology.org /website/article.asp?id=387 (1555 words)

	neo-neocon: Spy vs. spy: the problem of the false negative vs. the false positive
		But in the case of self defense, the false negative is, as Callimachus points out, a good deal more dangerous, if one is looking at it from the point of view of the need to prevent a threat from becoming a reality.
		For a certain number, if in fact Bush's intelligence-gathering had been guilty of a false negative rather than the false positive that appears to have been the case, they'd be saying the false negative was worse, instead (just look at the 9/11 Commission for examples).
		Whichever error the president made, a “false positive” or a “false negative,” it was a colossal error.
	neo-neocon.blogspot.com /2006/01/spy-vs-spy-problem-of-false-negative.html (5460 words)

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