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*  Chemical test in mushroom identification
Agaricus placomyces and Agaricus xanthodermus produce false negative reactions. Sometimes referred to as "Schaeffer's reaction ... Three results are expected with the iron salts tests: no change indicates a negative reaction; a color change to olive, green ... A positive reaction of Schaeffer's test, which uses the reaction of aniline and nitric acid on the surface of the mushroom, is ... "The Meixner test in the detection of alpha-amanitin and false-positive reactions caused by psilocin and 5-substituted ...
*  Voges-Proskauer test
A reversal in the order of the reagents being added may result in a weak-positive or false-negative reaction. VP is one of the ... The reaction was developed by Daniel Wilhelm Otto Voges and Bernhard Proskauer, German bacteriologists in 1898 at the Institute ... A cherry red color indicates a positive result, while a yellow-brown color indicates a negative result. The test depends on the ... VP negative organisms include Citrobacter sp., Shigella, Yersinia, Edwardsiella, Salmonella, Vibrio furnissii, Vibrio fluvialis ...
*  Urine test strip
False-negative reactions can result when urine with a high specific gravity contains crenated red blood cells that do not lyse ... Traditionally, ascorbic acid (vitamin C) has been associated with false-negative reagent strip reactions for blood. Both ... The formaldehyde used as a preservative produces false negatives in both reactions. Urinary infections can be identified ... The presence of strong oxidising agents or formaldehyde can cause false positives. False negative results are associated with ...
*  Antibodies from lymphocyte secretions
False-positive reactions with enzyme-linked immunosorbent assay of Mycobacterium tuberculosis antigens in pleural fluid. J Med ... The ELISA titer indicate the positive or negative result. The diagnosis of TB is most complicated. The routine diagnosis for TB ... The low predictive value is a result of cross-reactivity with BCG and atypical mycobacteria, as well as falsenegative reactions ... But culture need 6-8week with 10-20% false positive results. A rapid serological test for diagnosis, follow-up of disease ...
*  Stool guaiac test
Vitamin C can cause analytical false negatives due to its anti-oxidant properties inhibiting the color reaction. If the card ... This can cause false negative results in upper gastrointestinal bleeding sources, or in right colon adenomas and cancers that ... However, although heme breakdown is less than globin during intestinal transit, false negative results can be seen with the ... Wells HJ, Pagano JF (1977). "Hemoccult test - reversal of false-negative results due to storage". Gastroenterology. 72: 1148. ...
*  Elvis Presley
It fosters almost totally negative and destructive reactions in young people. It smells phoney and false. It is sung, played ... He was out of prison, man." Binder said of Presley's reaction, "I played Elvis the 60-minute show, and he told me in the ... According to Moore, "His movement was a natural thing, but he was also very conscious of what got a reaction. He'd do something ... Presley had another attack of nerves during the first set, which drew a muted reaction. A more composed and energetic second ...
*  Allergic reactions to anaesthesia
However, skin testing can be misleading in giving false positive and false negative results. Although complications during ... Serious allergic reactions to anesthetic medications are rare and a usually attributable to factors other than the anesthetic. ... The severity of the reaction whilst under anaesthesia is due to the fact that the anaesthetist is only made aware of the ... Anaesthetists are trained to recognise if an allergic reaction is occurring. The identification of a complication is made by ...
*  Hook effect
In this case, the result is a false negative. The range of relatively high antibody concentrations within which no reaction ... Stamm AM, Polt SS (September 1980). "False-negative cryptococcal antigen test". JAMA. 244 (12): 1359. doi:10.1001/jama.244.12. ... resulting in false negatives or inaccurately low results. Other common forms of interference include antibody interference, ... The serological test is mainly seen in the precipitation reaction. The antibody that fails to react is known as the blocking ...
*  Chlamydia trachomatis
... meaning they are very accurate and are very unlikely to have false-negative test results. A polymerase chain reaction (PCR) ... C. trachomatis is a weakly Gram-negative bacterium. It is ovoid in shape and nonmotile. The bacteria are non spore-forming, but ...
*  Guinea pig maximisation test
20 animals would typically be used to ensure against false negative results. The OECD Guidelines for the Testing of Chemicals ... and their allergic reaction, if any, measured. 15% of guinea pigs must show a reaction for the test to be considered positive. ... along with an adjuvant to enhance the immune reaction of the guinea pig. The guinea pigs are then a short while later exposed ...
*  Brucellosis
The inability to diagnose B. canis by SAT due to lack of cross-reaction is another drawback. False-negative SAT may be caused ... Due to the similarity of the O polysaccharide of Brucella to that of various other Gram-negative bacteria (e.g. Francisella ... by Polymerase Chain Reaction". Croatian Medical Journal. 51 (4): 306-313. doi:10.3325/cmj.2010.51.306. Vrioni, Georgia; Pappas ... Brucellosis is a reproductive disease, so has an extreme negative impact on the population dynamics of a species. This becomes ...
*  Effects of stress on memory
... while the negative effect of stress causes more false alarms and mistakes when compared to a normal condition. The researchers ... In a study by Duncko et al., the positive effect of stress manifested itself as a decreased reaction time in participants, ... This negative effect on the retrieval of memories caused by stress can be attributed to cortisol, the stress hormone that is ... This is due to the fact that the negative cue is perceived as a factor in the induced stress, whereas the positive cue is not. ...
*  Tine test
If a minor reaction is considered doubtful, the OT test is less accurate and may fail to detect TB, producing a false negative ... Indications are usually classified as positive, negative, or doubtful. Because it is not possible to control precisely the ...
*  HLA-DQ7
... but still results in some false negatives, for *0304 the typing efficiency is poor and cross-reaction with DQ8 is relatively ... Bunce M, Taylor CJ, Welsh KI (1993). "Rapid HLA-DQB typing by eight polymerase chain reaction amplifications with sequence- ...
*  Diagnosis of HIV/AIDS
False negative: The test incorrectly indicates that HIV is absent in an infected person. Nonspecific reactions, ... Autoimmune diseases, such as systemic lupus erythematosus, have also rarely caused false positive results. Most false negative ... reporting false-positive rates of 0.0004 to 0.0007 and false-negative rates of 0.003 in the general population. The p24 antigen ... Antibody tests may give false negative (no antibodies were detected despite the presence of HIV) results during the window ...
*  Daria
... ran the risk of setting up false expectations and disappointment in the viewers - which could lead to a negative reaction to ...
*  Menace reflex
Such reactions to non-visual stimuli are a widespread cause of false positives and false negatives when pet owners test their ...
*  Penile plethysmograph
... show a normal reaction to the test. The Government argues that such false negatives render the test unreliable." According to ... "Until a way can be devised to detect and/or control false negatives and false positives, the validity of the test data will be ... accurate Results are subject to faking and voluntary control by test subjects High incidence of false negatives and false ... Abel, G. G.; Huffman, J.; Warberg, B.; Holland, C. L. (1998). "Visual reaction time and plethysmography as measures of sexual ...
*  Nontreponemal tests for syphilis
... when a large number of untreated patients will be negative by these methods. With nontreponemal tests, false-positive reactions ... Additionally these tests may show false-negative when the patient's antibody titer is very high due to a hook effect (also ... This reaction is the foundation of "nontreponemal" assays such as the VDRL (Venereal Disease Research Laboratory) test and ... and trained personnel to perform and interpret test reactions. Ratnam, S (2005). "The laboratory diagnosis of syphilis". ...
*  Alpha-gal allergy
A traditional skin prick allergy test for allergy to meat may give a false negative answer. Blood tests for IgE response ... After this reaction, the future intake of mammal meat with the same alpha gal will result in an allergy reaction. Symptoms of ... Alpha-gal allergy, also known as meat allergy or Mammalian Meat Allergy (MMA), is a reaction to galactose-alpha-1,3-galactose ( ... In 70% of cases the reaction is accompanied by respiratory distress and as such is particularly harmful to those with asthma. ...
*  Ploy
Critical reaction was mixed. Russell Edwards, writing for the film industry trade publication Variety, was negative, ... criticizing the film for its "glacial pace" and saying it was "too flimsy and false to truly engage." Lee Marshall, writing for ...
*  Self-fulfilling prophecy
In other words, a positive or negative prophecy, strongly held belief, or delusion-declared as truth when it is actually false- ... may sufficiently influence people so that their reactions ultimately fulfill the once-false prophecy. Self-fulfilling prophecy ... a false definition of the situation evoking a new behavior which makes the original false conception come true. This specious ... False rumours spread that something is wrong with the bank and more customers rush to the bank to try to get some of their ...
*  Mycobacterium avium avium
False-negative tuberculin tests are common in dogs. Radiographs and a thorough history are useful in diagnosis. Affected dogs ... However, cross-reaction between M. avium avium, M. tuberculosis, or M. avium paratuberculosis is a disadvantage. Dogs, cats, ...
*  Cardiac stress test
Atheroma Vulnerable plaques The test has relatively high rates of false positives and false negatives compared with other ... Aminophylline may be used to attenuate severe and/or persistent adverse reactions to Adenosine and Lexiscan. The stress test ...
*  Blood Swept Lands and Seas of Red
Although the installation struck a chord with the public, it received negative reactions from some press critics. A. A. Gill of ... "false nobility" and being a "prettified and toothless" memorial. Tom Piper said in response that "... it is a remarkably good ...
*  Pirates of the Caribbean: Dead Men Tell No Tales
Both teasers received a highly positive reaction from audiences. The official trailer was released on March 2, 2017. Another ... the wave of negative reviews from critics (mainly on Rotten Tomatoes), franchise fatigue and the problem of Memorial Day ... its delight in its own inventions so forced and false, that it becomes almost the perfect opposite of entertainment." Michael ...