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Topic: False positive

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False negative

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	False positive (Site not responding. Last check: 2007-10-12)
		The trouble with false positives is that the more you test the more apparent disease you find, also called a false-positive explosion.
		For instance, mammography screening has a false negative rate of 5 to 10% depending on age, that is 5 to 10% of women without breast cancer nevertheless receive a positive test result.
		The false positive rate and the false negative rate are dependent: to decrease one is to increase the other.
	www.jr2.ox.ac.uk /bandolier/booth/glossary/falsepos.html (142 words)

	HIV & AIDS - False Positive Viral Loads
		Although it is reasonable that false positive viral loads would appear any time there is a great deal of cell death because of the high quantities of RNA that are released when cells die in large numbers, no controlled studies were found that attempt to determine what factors influence the likelihood of false positive results.
		In contrast to the high rate of false positive results observed with gag primers, env DNA [env is another protein thought to be specific to HIV] was not detected by laboratory B in any of the specimens from either seronegative or seropositive individuals.
		False positive viral loads occur commonly in 3 to 10% of people who are HIV negative, with the highest reported rate being 60%.
	www.virusmyth.net /aids/data/miloads.htm (6966 words)

	BeefTalk: The fire drill - A false positive test
		False positive results have not been as detrimental as false negatives, and have been allowed to exist, along with subsequent development of additional tests, to help further reduce the incidence of a false positive.
		The false positive is the process of calling or labeling a sample as positive when in reality the sample is negative.
		In the case of the false positive test for BSE, there was no danger to the food supply and the general public remained safe.
	www.mad-cow-facts.com /News-Commentary/beeftalk.htm (437 words)

	ACS :: Study Looks at Reasons for False-Positive Mammograms
		False positives were seen more often in women who were premenopausal or who were postmenopausal and taking estrogen, women who had previous breast biopsies and women with a family history of breast cancer.
		A woman who consistently went to a radiologist with a low rate of false positives would only have a 15 percent chance of a false positive after nine mammograms.
		If she went to a radiologist with a high rate of false positives, she would have a 90 percent chance after nine mammograms.
	www.cancer.org /docroot/NWS/content/NWS_1_1x_Study_Looks_at_Reasons_for_False_Positive_Mammograms.asp (886 words)

	Paternity Testing Corporation - False Positive Test Results
		One of the biggest concerns to recipients of paternity tests is that even if the test shows a 99% or greater probability that the tested man is the biological father of the child, he still might not be.
		The chances of receiving a false positive are 100 times greater if the test only shows a 99.0% probability of paternity compared to a 99.99% probability of paternity.
		If you have questions about false positive tests, or if you are concerned that you may have received a false positive test, please call our toll-free telephone number at (888) 837-8323.
	www.ptclabs.com /false_positive_test_results.htm (496 words)

	Patient Education - Fluorescent Antinuclear Antibody Test "False Positive"
		While a “false positive” FANA test typically signals the presence of antinuclear antibodies in a healthy individual, these antibodies are usually of no clinical significance and are best ignored.
		However, if the positive results are associated with an infection or the use of certain drugs, eliminating the infection or stopping use of the offending drug may lead to disappearance of the antinuclear antibodies.
		The significance of a positive FANA test in RA There is little evidence that antinuclear antibody testing can be used either diagnostically or as a measure of disease activity in RA.
	www.rheumatology.org /public/factsheets/fana.asp (1607 words)

	False Positive Explosion [Dec 1994; 10-1] (Site not responding. Last check: 2007-10-12)
		For the Health Service, the generation of many false positives places increasing burdens on overstretched resources, resources which, in the end, are wasted.
		False positives cause problems for patients, doctors and the Health Service because the GP who elicits a false positive biochemical test will almost certainly have to take some further action.
		Definition of a "positive" is often set by using the upper 95th centile of a population as a cut off.
	www.jr2.ox.ac.uk /bandolier/band10/b10-1.html (944 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 (1031 words)

	Positive Newborn Screens Exacerbate Anxiety Even When Shown False - CME Teaching Brief® - MedPage Today
		Both mothers and fathers of kids who had a false-positive result on one of the tests were invited to participate when their child was first referred for additional confirmatory testing, and were surveyed six or more months after the test was determined to have been falsely positive.
		Mothers whose children tested-false positive said they themselves were less healthy than mothers whose babies had normal results, and 15% of mothers in the false-positive group said that their child required extra parental care, compared with only 3% of mothers in the comparison group (P=0.01).
		In all, 17 (11%) of mothers in false positive had index scores higher than 85, suggesting a need for clinical intervention.
	www.medpagetoday.com /OBGYN/Pregnancy/tb/3469 (1099 words)

	Medications & Substances Causing False Positives - Pass Your Drug Test .com
		False Positive drug test, wrong drug test results, Pass a Urine Drug Test, Pass a drug test.
		Dr. John Morgan of the Dept. of Pharmacology of New York City University writes: "A false positive test could occur in some individuals because they excrete unusually large amounts of endogenons lysozyme or malate dehydrogenase." Dr. Morgan judges that natural enzyme interference may run as high as 10% of positive samples.
		James Woodford, a toxicologist associated with Emory University labs hypothesized the pigment melanin which protects the skin from the sun, approximates the molecular structure of the THC metabolite to cross react on the marijuana urine test.
	www.passyourdrugtest.com /false-positives.htm (827 words)

	Amazon.com: False Positive: Books: William Cutrer,Sandra Glahn (Site not responding. Last check: 2007-10-12)
		Although "False Positive" doesn't have the immediate hook of a Grisham-type thriller, it does have the very human motivations, readable dialogue, and ethical dilemmas that Grisham has used to such marvelous effect.
		False Positive is a fast-paced novel that handles the volatile subject of abortion in a tender and compassionate way.
		False Positive delivers in all of these areas.
	www.amazon.com /False-Positive-William-Cutrer/dp/1578565677 (1615 words)

	Symantec Security Response - What is a false positive?
		A false positive, also known as a false detection or false alarm, occurs when an antivirus program detects a known virus string in an uninfected file.
		A false positive can also occur when a program performs an action, which appears to the antivirus program to be a virus-like activity.
		False detections, once confirmed, are usually corrected as soon as possible
	service1.symantec.com /sarc/sarc.nsf/info/html/what.false.positive.html (154 words)

	Midwifery Today Forums - Home pregnancy test, false- positive? (Site not responding. Last check: 2007-10-12)
		I could not find any info on whether it is possible for a test to turn positive after a while, even though it is in fact negative.
		I too have a hard time believing in false positive (because as you said it is HCG it measures), but at the same time....
		On a pregnancy test, a faint test line - or color band - is usually indicative of a positive result, as long as it's read within the time frame - or reaction time of the test (usually at 5-10 minutes).
	www.midwiferytoday.com /forums/topic.asp?TOPIC_ID=5531 (661 words)

	SCREENING FOR HIV: CAN WE AFFORD THE FALSE POSITIVE RATE?
		Even so, positive initial and confirmatory tests in someone at low risk of HIV infection are by no means synonymous with infection, because of the possibility of false positive results.
		Among specimens that were repeatedly positive on enzyme immunoassay, the false positive rate was 1.17 percent.(22) If the false positive rate of enzyme immunoassays is about 0.4 percent, the joint false positive rate of the two tests performed sequentially should be about 0.005 percent.
		The joint false positive rate may rise if single-stage testing is introduced into physicians' offices; a false positive rate of 0.6 percent was recently reported for such a test.(24,25) The joint rate will rise if tests are performed and interpreted less carefully when the amount of testing increases substantially.
	www.healtoronto.com /testing_meyer.html (3306 words)

	Windows Genuine Advantage : When a 'False Positive' isn't a false positive (Site not responding. Last check: 2007-10-12)
		I think it's super important to be clear about the idea of 'false positives' so I'd like to take this opportunity to explain a bit about how WGA works and why when some people believe they have a legit license for Windows but WGA fails to validate their installed copy.
		To be precise, an actual 'false positive' would occur if WGA identifed a specific copy of windows installed on a system as non-genuine or unlicensed when in fact it was genuine and licensed.
		These scenarios are not real 'false positives' because that the WGA software did perform as designed and accurately detect an install of Windows that was not licensed for the PC it was installed on or was wrong for some other reason.
	blogs.msdn.com /wga/archive/2006/07/16/667063.aspx (2685 words)

	Epinions.com - You can get a false positive result on a home pregnancy test
		While a false positive on an HPT is not nearly as common as a false negative, it can still happen.
		Your HPT is not accurate after that specified period, and the positive result that shows up two hours should not be relied on.
		A positive result may mean pregnancy or may indicate residual injected HCG, but if you get a negative result followed by positive results, it's a good sign that the injected HCG has left your system and the positive test is accurate.
	www.epinions.com /kifm-review-694-98B3030-38E1096E-prod4 (380 words)

	False positives
		Employees who test positive can be mandated to test five to six times a year for as long as five years.
		False or innocent positives occur when a drug or metabolite has been detected but is not present in the urine specimen.
		For instance, Robitussin and diet pills can produce a false positive for amphetamines; ibuprofen and various antibiotics can duplicate marijuana; the combination of a kidney infection and diabetes can cause an individual to test positive for cocaine; migraine medications and anti-depressants can mimic LSD; and poppy seed consumption can give a positive reading for opiates.
	firechief.com /mag/firefighting_falsepositives (2546 words)

	Drug Tests - False Positive - Methamphetamine - Ask the Expert
		False positive for methamphetamine on drug tests of people using ephedra
		However, many of them can give a false positive result, in the sense that ephedra use will show up as drug use.
		By the time one tests blood or urine for the drug, the body has metabolized most of it, so many tests are directed towards testing for metabolites.
	www.supplementquality.com /z_askexpert/ephedra_testing.html (284 words)

	False Positive (Site not responding. Last check: 2007-10-12)
		False positive results can also be damaging in their own right, and not just as clutter.
		The requirements stated that any number of false positives were acceptable as long as 100% of faults were always detected.
		If the disease is in 3% of the population, and there is a 7% chance of false positives, this means that you only need to run the expensive suite over 10% of the population, saving 90% of the test costs.
	c2.com /cgi/wiki?FalsePositive (447 words)

	False Positive (Site not responding. Last check: 2007-10-12)
		A false positive occurs when a diagnostic procedure returns a positive result while the true state of the subject is negative.
		For example, if a test for strep says the patient has strep when in fact he or she does not, then the error in diagnosis would be called a false positive.
		In some contexts, a false positive is called a false alarm.
	davidmlane.com /online_stat/glossary/false_positive.html (75 words)

	False Positive Pregnancy Test
		There are several reasons why a woman may obtain a positive result on an a home pregnancy test when she is not actually pregnant.
		In order for the test to be positive it should change color and have a colored line at the determined testing time.
		If you receive a positive result from a home pregnancy test it is important to follow up with your doctor for medical care.
	www.justmommies.com /articles/false-positive-pregnancy-test.shtml (769 words)

	POAS ~ False Positives
		Because true false positives are very rare, it is best to assume that a positive result is genuine.
		She blames a "false positive." She may or may not continue to see positive results even after her period has started.
		If you experience a positive pregnancy test that persists after your period has started, or you have any reason to suspect you are not actually pregnant in spite of a positive test, call your doctor.
	www.peeonastick.com /falsepos.html (1928 words)

	false positive definition - Dictionary - MSN Encarta
		false positive definition - Dictionary - MSN Encarta
		Search for "false positive" in all of MSN Encarta
		medicine science erroneous test result: the result of a medical, chemical, or biological test that appears to be positive but is in fact erroneous
	encarta.msn.com /dictionary_701705992/false_positive.html (118 words)

	False Positive \| False Positive Drug Test & Testing Results (Site not responding. Last check: 2007-10-12)
		False positive drug test results is a major problem.
		He has said that 'The widespread testing and reliance on tell-tale traces of drugs in the urine is simply a panic reaction invoked because the normal techniques for controlling drug use haven't worked very well.
		A letter for your employer stating that facts about false positives, a request for a re-test and a spot to provide your testimony.
	www.passyourtest.com /falsepositive.html (463 words)

	Low Risk of False Positives with Mammography? (Site not responding. Last check: 2007-10-12)
		Some researchers have suggested that the cost of false positives on mammograms might outweigh the benefits of early detection.
		They also wanted to see how many women had a false positive that led them to have a biopsy—in other words, how many women had a biopsy that showed they did NOT have breast cancer.
		Is the increased risk of false positives worth it? Most doctors, researchers, and women agree that it is. But if you are reluctant to get a mammogram because you fear getting a false positive, talk to your doctor about your concerns.
	www.breastcancer.org /mammogram_false_positive.html (1058 words)

	False Positive Drug Test.com -Solutions for false positives
		False positive drug test results is a major problem worldwide.
		Inaccurate urine and hair drug testing which can report false positive drug test results has been called an "epidemic" by Ronald Siegel, the leading psychopharmacologist at UCLA.
		FlasePositiveDrugTest.com walks our clients through the steps to fighting a false positive drug test and keeping your job, family and life.
	falsepositivedrugtest.com /index.htm (188 words)

	Base Rates (Site not responding. Last check: 2007-10-12)
		Suppose that at your regular physical exam you test positive for Disease X. Although Disease X has only mild symptoms, you are concerned and ask your doctor about the accuracy of the test.
		The miss and false positive rates are not necessarily the same.
		Since the false positive rate is 0.09, 9% of these 980,000 people will test positive for the disease.
	cnx.rice.edu /content/m11171/latest (1138 words)

	Pass Urine Drug Test - Urine Drug Testing!
		Ibuprofen: Ibuprofen is a common pain reliever that (even in low dosages) used to cause a false THC positive on the EMIT test.
		Valerian root is reported to cause false positives for benzodiazepines.
		Zoloft is reported to cause false positives in urine screens, although for what specific substance isn't clear.
	www.alwaystestclean.com /false_positive_causes.htm (451 words)

	Praetor - Low False Positive Rate (Site not responding. Last check: 2007-10-12)
		Praetor maintained very low false positive numbers over the test period by consistently averaging a FPR rate of less than 0.01%.
		A false positive rate of 0 was achieved on over 85% of the days in the testing period.
		False positives, when they do occur, may be reviewed and approved by individual users through the browser-based Personal Log Viewer.
	www.cmsconnect.com /Praetor/Stats/SpamFalsePositiveRate.htm (374 words)

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