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| | False negative - Wikipedia, the free encyclopedia |
 | | The probability that an observed negative result is a false negative versus a true negative may be calculated (and the problem of false negatives demonstrated) using Bayes' theorem. | | | False negatives are a significant issue in medical testing. | | | False negatives produce serious and counterintuitive problems, especially when the condition being searched for is common. |
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http://en.wikipedia.org/wiki/False_negatives
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| | Multiple Factors May Increase Risk of False Negative Sentinel Lymph Node Biopsy Results |
| | However, further analysis identified factors that were associated with an increased risk of a false negative result. | | | Researchers concluded that previous smaller studies incorrectly to attributed the patient’s age to the likelihood of a false negative result. | | | Of these 3,870, 1,243 were determined to be truly positive, and 2,521 were found to be truly negative; this left 106 false negative results. |
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http://patient.cancerconsultants.com/news.aspx?id=34508
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| | Critical Revision of Presumptive Tests for Bloodstains by Ponce and Verdú Pascual (Forensic Science ... |
| | This would give rise to a false negative in an otherwise reliable presumptive test, with the result that important evidence may be lost. | | | Our study focused on false negatives by applying the tolidine test on a bloodstain (Castelló 1997; Gisbert 1998). | | | The second experiment we performed demonstrates the possibility of obtaining false negatives with reagents frequently used in presumptive tests. |
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http://www.fbi.gov/hq/lab/fsc/backissu/july1999/ponce.htm
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| | Strategies to Reduce False Positives and False Negatives in NIDS |
| | 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. | | | To reduce false negative conditions it is essential to understand the device's weaknesses and implementation issues that can reduce its effectiveness. | | | Fortunately, there are actions that can be taken to reduce the chance of false negative conditions without increasing the number of false positives. |
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http://www.securityfocus.com/infocus/1463
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| | Another Bird Flu False Negative for Second Nurse in Thai Binh? |
| | another false negative on the female nurse from Thai Binh suggests that the sensitivity of the PCR test in northern Vietnam is similar to the 20% | | | The repeated negative results on patients who clinically present as H5N1 positive should require outside testing by a lab with a more | | | The nurse had clinical signs of avian influenza and exposures to H5N1 positive patient(s) and co-workers. |
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http://www.recombinomics.com/News/03170501/Another_H5N1_Nurse_False_Negative.html
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| | s020506a - HIV ELISA Test - False Negative Results |
| | Title: False negative anti-HIV-1/HIV-2 ELISAs in acute HIV-2 infection. | | | CONCLUSION: The commercial kit had a sensitivity of 99.2% (497/501), or less if the additional three patients with false negative results were taken into account. | | | s020506a - HIV ELISA Test - False Negative Results |
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http://www.emory.edu/WHSCL/grady/amreport/litsrch01/s020506a.html
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| | 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. | | | Thus, at least one confirmed positive in each of the first Thai Binh clusters initially tested negative for H5N1. | | | Bird Flu False Negative for Second Nurse in Thai Binh? |
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http://www.recombinomics.com/News/03130503/H5N1_Nurse_False_Negative.html
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| | False negative? |
| | I think that perhaps the staph test was a false negative. |
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http://www.medhelp.org/perl6/dermatology/messages/31687a.html
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| | false-negative? |
| | I had something that resembled a canker sore inside my mouth 2 weeks after coming in contact with a female (saliva) that has hsv2 genitally but no symptoms orally, i went and took a test because i thought it was herpes, so did the doctor from the looks of it. | | | I try not to get into diagnostic debates with a doc who has examined the patient, but herpes virtually never starts with a single sore inside the mouth, and 2 weeks is too long an incubation period anyway. | | | Usually the HSV culture test would be positive if the lesion is still "open" and painful, i.e. |
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http://www.medhelp.org/forums/STD/messages/423.html
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| | GLOSSARY - JOHNE'S INFORMATION CENTER |
| | Positive and negative diagnostic test results can be expressed as probabilities (of being correct). | | | A test result that is negative even though the tested subject IS infected/diseased. | | | This defines the outcome of a diagnostic test. |
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http://www.johnes.org/glossary.html
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| | 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. | | | The two percentages listed above are the false negative and false positive rates, respectively. | | | These are very rough guidelines; further work on refining these would be appreciated. |
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http://www.childrensmercy.org/stats/ask/roc.asp
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| | Negative - Imdb Glossary letter: N |
| | The philosophical concept of negative liberty refers to an individual's The distinction between negative liberty and positive liberty was drawn by | | | Is negative behavior and feelings (anger- depression-fear-guilt-jealousy) destroying a happy relationship, marriage and family? | | | Even the intellectually most advanced groups, the researchers, educators, managers and technologists, often feel overwhelmed by the changes in their domain. |
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http://www.spiderarea.com/q/negative.htm
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| | Cervical Tissue Changes May Explain False-Negative Pap Smears |
| | Writing in the June issue of the American Journal of Obstetrics and Gynecology, physicians at the Keck School of Medicine of USC and colleagues in California and Taiwan are the first to suggest this explanation for the frequent occurrence of false negative Pap smears. | | | "Aberrant expression of E-cadherin in cervical intraepithelial neoplasia correlates with a false negative Papanicolaou smear." American Journal of Obstetrics and Gynecology, Vol. | | | "Never before have we seen such clear evidence that barriers to exfoliation are linked to false negative Pap smears," Felix said. |
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http://www.usc.edu/uscnews/stories/8207.html
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| | What is a false positive? |
| | A false negative means that the test said a message was not spam, when in reality it was. | | | The terms false positive and false negative (along with true positive and true negative) come to us from the world of diagnostic tests. | | | We care more about false positives than we do about false negatives (unless the CEO is getting inundated with false negatives). |
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http://www.networkworld.com/reviews/2004/122004spamside3.html
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| | [No title] |
| | A test with poor specificity will result in healthy persons being told they have the condition (false positives). | | | Labeling may affect behavior; for example, studies have shown that some persons with hpertension identified through screening may experience altered behavior and decreased work productivity.2,3 | | | Predictive Value negative test who do not have c+d |
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http://www.uwf.edu/hlsd/EfficacyofaScreeningTest(Handout).htm
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| | FALSE POSITIVE DRUG TEST |
| | Find false positive drug test and more at Lycos Search. | | | Find results for false positive drug test and anything else you are looking for instantly! | | | Read about false positive drug test in the free online encyclopedia and dictionary. |
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http://false-positive-drug-test.medicationhelp.net
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| | Mono-Vacc |
| | No subject had a positive Tine and negative Mantoux, and there were seven doubtful Tines with negative Mantoux tests. | | | All together 40.1% of all readings were Tine negative and Mantoux positive. | | | False negative reactions occurred in 1.2%, which is within the intratest variability of the Mantoux test, and thus unlikely to be statistically significant. |
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http://www.epi.hss.state.ak.us/bulletins/docs/b1979_12.htm
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| | Forum on HIV and AIDS Related Cancers: False negative HIV test with KS-HIV? |
| | Forum on HIV and AIDS Related Cancers: False negative HIV test with KS-HIV? | | | It doesn't even sound like you have KS; if you do have worrisome lesions, then by all means, seek professional help. | | | Also I keep seeing small lesions in my genital area and rashes in my mouth. |
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http://www.thebody.com/Forums/AIDS/Cancer/Archive/screening/Q89812.qna
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| | FALSE NEGATIVE PREGANCY TESTS AND PAXIL |
| | Find false negative pregancy tests and paxil and more at Lycos Search. | | | Find results for false negative pregancy tests and paxil and anything else you are looking for instantly! | | | Research false negative pregancy tests and paxil at HighBeam |
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http://false-negative-pregancy-tests-and-paxil.medicationhelp.net
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| | Appendix A. False Negatives and False Negative Rates (FNRs): A Review |
| | In other studies, false-negative cases were based on a review diagnosis of ACUS rather than SIL when the initial diagnosis was negative; although the former is often used for a laboratory's internal review, only the latter is appropriately used for external evaluation of a laboratory. | | | Appendix A. False Negatives and False Negative Rates (FNRs): A Review | | | In addition, although an accurate laboratory FNR is based on random rescreening of a laboratory's cases, some published Pap smear rescreening studies focused on specimens collected from patients at high risk for developing cervical cancer or patients who were subsequently clinically diagnosed with SIL or carcinoma. |
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http://www.cdc.gov/MMWR/preview/mmwrhtml/00050522.htm
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| | Bad Test Results |
| | First, test only when evidence for drug use exists, such as erratic behavior. | | | The outcome of these tests are either positive or negative, yes or no. We like to think the | | | A much higher percent of people showing drug abuse symptoms will actually be drug users and this reduces the the percentage of innocent people who are falsely accused. |
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http://www.intuitor.com/statistics/BadTestResults.html
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| | Meds & False Negative Pregnancy Test |
| | Haven't ever heard of a false negative induced by these medications. | | | I haven't felt this way since my last pregancy, which was before I was on any medication. | | | However, feeling like there's been some huge hormonal change, and missing periods, could be related. |
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http://www.bipolarworld.net/Phelps/ph_2002/ph684.htm
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| | Is it more common to have a false positive than a false negative? |
| | Is it more common to have a false positive than a false negative? | | | Isn't it more common to have a false positive than a false negative? | | | She just tested negative from an oral test at an anonymous clinic. |
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http://hivinsite.ucsf.edu/insite?page=ask-01-07-27
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| | Clinical Calculator 1 |
| | For any particular negative test result, the probability that it is: | | | test specificity (conditional probability that the test will be negative if the condition is absent); | | | predictive values of the test (probabilities for true positive, true negative, false positive, and false negative); and |
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http://faculty.vassar.edu/lowry/clin1.html
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| | False negative definition - Medical Dictionary definitions of popular medical terms |
| | An example of a false negative: a particular test designed to detect cancer of the toenail is negative but the person has toenail cancer. | | | False negative: A result that appears negative but fails to reveal a situation. | | | False negative definition - Medical Dictionary definitions of popular medical terms |
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http://www.medterms.com/script/main/art.asp?articlekey=3376
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| | USCAP 2002 Annual Meeting |
| | Despite the fact that unfixed air-dried smears may be associated with false positive and false negative immunostaining, a method of air-drying followed by weak fixation in 0.1% formal saline has been recently described which resulted in good signal preservation after antigen retrieval and reduced background staining. | | | As a method to overcome loss of antigen binding sites resulting from specimen fixation and processing, development of antigen retrieval methods has been associated with a new series of pitfalls and interpretation errors. | | | To prevent unwanted antigen loss and false negative staining cytologic smears are best processed for standard immunoperoxidase and avidin-biotin-peroxidase reactions by immediate 95% ethanol fixation. |
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http://www.uscap.org/site~/91st/cyto1a.htm
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| | TriPath - Phys Resources - Epidemiology of False-Negative Pap Smears |
| | The range experts quote most often is 20% to 45%; an NIH consensus panel agreed that any single Pap smear has a 20% chance of being a false negative. | | | Estimates of the prevalence of false-negative Pap smears cited by the National Institutes of Health (NIH) U.S. Preventive Services Task Force range between 1% and 80%, depending on study design. | | | The Pap smear is also unreliable in detecting certain gynecological neoplasias, particularly endocervical glandular neoplasia. |
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http://www.tripathimaging.com/cr_epidemiology.htm
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| | [No title] |
| | (L i (%sign-case i %false %false %true))) (%negative? | | | ;------------------------------------------------------------------------ ; Negative numbers and -1: a recursive way ; ; If we can define a term representing -1, we can approach the ; predecessor function in a systematic way, as an addition of -1 to a ; number. | | | (g u) is a pair as well, whose first element however ; is set to %false. |
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http://okmij.org/ftp/Computation/lambda-arithm-neg.scm
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| | Clinical Calculator 2 |
| | Given the prevalence of a condition within the population and the sensitivity and specificity of a test designed to indicate the presence of that condition, this page will calculate the predictive values of the test (probabilities for true positive, true negative, false positive, and false negative) and its positive and negative likelihood ratios. | | | To proceed, enter the known or hypothetical values of prevalence, sensitivity, and selectivity into the designated cells, then click the «Calculate» button. | | | Click this link only if you did not arrive here via the VassarStats main page. |
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http://faculty.vassar.edu/lowry/clin2.html
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| | False negative |
| | The proportion of negative tests among people with the disease of the condition. | | | The false negative rate and the false positive rate are dependent: to decrease one is to increase the other. | | | 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. |
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http://www.jr2.ox.ac.uk/bandolier/booth/glossary/falseneg.html
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| | HIV/HCV Coinfected Patients May Have False Negative HCV Antibody Test Result |
| | Identifying these patients will be difficult since there is no significant relationship between any relevant patient characteristic and a false negative HCV antibody assay. | | | Of 474 patients that had both an HCV antibody and HCV RNA PCR assay, the overall prevalence of HIV-infected patients with a negative HCV antibody assay and a positive HCV RNA PCR was 3.4%. | | | Prevalence of and risk factors for HCV RNA detection in HIV/HCV co-Infected patients who are HCV antibody negative. |
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http://www.hivandhepatitis.com/hiv_hcv_co_inf/052202a.html
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| | (Page 9 of 16) Module 3: Diagnosis of Tuberculosis Infection and Disease |
| | Because of their risk for anergy and for TB, in selected situations HIV-infected people may be tested for anergy if they have a negative reaction to the tuberculin skin test. | | | Because of their risk for anergy and their risk for TB, in selected situations HIV-infected people may be tested for anergy if they have a negative reaction to the tuberculin skin test. | | | Some people have a negative reaction to the tuberculin skin test even though they have TB infection. |
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http://www.phppo.cdc.gov/PHTN/tbmodules/modules1-5/m3/3-m-04a.htm
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| | Reasons for False Negative Lyme Disease Blood Test Results |
| | Antibodies against Bb may not be present in detectable levels in a patient with Lyme disease because the patient could be immunosuppressed for a number of other reasons, and the immune system is not reacting to the bacteria. | | | Antibodies against Bb may not be present in detectable levels in a patient with Lyme disease because the patient's antibodies may be bound with the bacteria with not enough free antibodies available for testing. | | | Reasons for False Negative Lyme Disease Blood Test Results |
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http://www.anapsid.org/lyme/lymeseroneg.html
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| | NEGATIVE EFFECTS RISPERDAL AUTISM |
| | Find negative effects risperdal autism and more at Lycos Search. | | | Find results for negative effects risperdal autism and anything else you are looking for instantly! | | | Find negative effects risperdal autism at one of the best sites the Internet has to offer! |
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http://negative-effects-risperdal-autism.medicationhelp.net
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| | AAP: False Negative Computed Tomography Results for Appendicitis More Likely in Thin Children |
| | As a result, they warn physicians that thin children with physical signs of appendicitis for whom CT scan results are negative may indeed be suffering from this condition. | | | SAN FRANCISCO, CA -- October 25, 2001 -- Thin children are more likely to have false negative results from computed tomography scans for acute appendicitis, according to new research. | | | Of greater concern is the rate of false negative results of CT scans when diagnosing acute appendicitis. |
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http://www.docguide.com/dg.nsf/PrintPrint/30B9030AFD3CE2A385256AF00047EF4E
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| | false negative - definition of false negative by the Free Online Dictionary, Thesaurus and Encyclopedia. |
| | false negative is not available in the general English dictionary and thesaurus. | | | This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. | | | false negative - definition of false negative by the Free Online Dictionary, Thesaurus and Encyclopedia. |
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http://www.thefreedictionary.com/false+negative
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| | Definition of false negative |
| | --> Definition: When a test incorrectly gives a negative result. |
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http://www.phoenix5.org/glossary/false_negative.html
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| | Pregnancy Test On First Day May Yield False-Negative |
| | women with a negative test result may fail to protect themselves from exposures to toxicants in the workplace or to medications that could damage a developing embryo." | | | The authors point out that some pregnancy kit package inserts state that if the test is negative, "you are probably not pregnant." | | | But for 10 percent of the women who became pregnant, the hCG test obtained on the first day of the expected missed period was negative, suggesting that implantation occurred later. |
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http://unisci.com/stories/20014/1010016.htm
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| | Dermatopathology False Negative Terms in UMLS. |
| | A medically-significant term, present in the image-legend but not captured by the program, was defined as a FALSE NEGATIVE. | | | This study examines the false-negative rate of UMLS-M concepts in publicly-available electronic dermatopathology text. | | | Conversely, a term captured by the program but not present in the text, was defined as a FALSE POSITIVE. |
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http://www.medparse.com/apep99dr.htm
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| | [No title] |
| | (simple) Are there any advantages (time, comfort, cost) Are there too many false positives or negatives? | | | Med 1993 ¡ G * ¨@ Positive predictive value 61.4% Negative predictive value 96.9% ó 7 + ¨ Overnight Oximetry Recordings D I f t i m e b e l o w 9 0 % i s | | | Does it add anything to the diagnostic routine? |
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http://amisleep.com/forms/modules/diagnostic.ppt
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