Results 261 to 270 of about 5,583,624 (329)
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Frequency of false‐negative reactions to the fragrance mix
Contact Dermatitis, 1993To estimate the frequency of false‐negative‐ reactions to the fragrance mix, the 8 constituents of the mix in concentrations of 5% (2% for cinnamic aldehyde) were added to the European standard series for routine testing. Patients with positive reactions to individual ingredients in the absence of a reaction to the mix were retested with serial ...
A C, de Groot +6 more
exaly +4 more sources
False Positive and Negative Hemoccult Reactions on a Normal Diet and Effect of Diet Restriction
Australian and New Zealand Journal of Medicine, 1980Summary: False positive and negative hemoccult reactions on a normal diet and effect of diet restriction. M. L. Bassett and K. J. Goulston, Aust. N.Z. J. Med. 1980, 10. pp. 1–4.The reliability of Hemoccult, a guaiacimpregnated slide for detecting faecal occult blood, was assessed on both normal and restricted diets.
M L, Bassett, K J, Goulston
exaly +4 more sources
False Negative Reactions and Sensitivity in the Urine Glucose Oxidase Test
Diabetes, 1965Some 6,217 random urine specimens were tested with both a glucose oxidase test (Combistix) and a copper reduction test (Clinitest). The ratio of positive Combistix to Clinitest was approximately 3 to 2. There were only eleven false negative enzyme paper tests.
R M, NAKAMURA +4 more
openaire +3 more sources
Fragrance patch tests prepared in advance may give false‐negative reactions
Contact Dermatitis, 2014SummaryBackgroundSeveral of the ingredients in fragrance mix I (FM I) have been shown to evaporate from petrolatum preparations applied in test chambers to an extent that can be suspected to affect the patch test result.ObjectivesTo compare the reactivity towards FM I and fragrance mix II (FM II) when they are applied in test chambers in advance and ...
Martin, Mowitz +3 more
openaire +3 more sources
Journal of Allergy and Clinical Immunology, 1988
The reliability of a qualitative test for sulfites in foods (Sulfitest sulfite test strips) was evaluated by comparison of the results obtained from the analysis of 90 food and beverage samples to results obtained by the quantitative, modified Monier-Williams method (the preferred procedure for sulfite analysis in foods of the Food and Drug ...
J A, Nordlee, S G, Naidu, S L, Taylor
openaire +3 more sources
The reliability of a qualitative test for sulfites in foods (Sulfitest sulfite test strips) was evaluated by comparison of the results obtained from the analysis of 90 food and beverage samples to results obtained by the quantitative, modified Monier-Williams method (the preferred procedure for sulfite analysis in foods of the Food and Drug ...
J A, Nordlee, S G, Naidu, S L, Taylor
openaire +3 more sources
False‐negative results by polymerase chain reaction due to contamination by glove powder
Transfusion, 1992ABSTRACT: The polymerase chain reaction (PCR) technique has become an important, widely employed method for the detection and quantitation of the nucleic acid sequences used in the diagnosis and monitoring of genetic and infectious diseases. Much attention has been directed at the problem of false‐positive PCR results, which are generally attributed ...
J G, de Lomas, F J, Sunzeri, M P, Busch
openaire +3 more sources
False positive and false negative reactions in HLA B-27 antigen testing
Transfusion, 1979The recent commercial availability of HLA B‐27 antiserum now enables laboratories without prior experience in HLA typing to test for this antigen. False positive and false negative reactions frequently occur and require judicious interpretation. In our laboratory, 30 of 100 specimens were positive for B‐27 and 70 were negative. Of the 30 positives, 10 (
exaly +3 more sources
International Journal of Cancer, 1974
AbstractTitration of anti‐complementary human sera may yield false negative or prozone reactions in anti‐complement immunofluorescence (ACIF) tests for antibodies to Epstein‐Barr virus‐associated nuclear antigen (EBNA) when the human complement (C') is added to the serum dilutions prior to charging of the target cell smears (two‐stage ACIF test).
W, Henle, A, Guerra, G, Henle
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AbstractTitration of anti‐complementary human sera may yield false negative or prozone reactions in anti‐complement immunofluorescence (ACIF) tests for antibodies to Epstein‐Barr virus‐associated nuclear antigen (EBNA) when the human complement (C') is added to the serum dilutions prior to charging of the target cell smears (two‐stage ACIF test).
W, Henle, A, Guerra, G, Henle
openaire +3 more sources
False-Negative Reactions of the “Hemoccult” Slide Test
New England Journal of Medicine, 1978K L, Cohen, E J, Luminati
semanticscholar +4 more sources