Results 251 to 260 of about 537,139 (296)
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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
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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
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Light-Chain Proteinuria: Spurious False-Negative Reaction to Sulfosalicylic Acid
Annals of Internal Medicine, 1985Excerpt To the editor: We report the case of a patient with multiple myeloma and renal failure secondary to heavy urinary excretion of kappa light chains.
N. STANLEY NAHMAN +5 more
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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 (
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Degradation of triglycidyl isocyanurate as a cause of false‐negative patch test reaction
Contact Dermatitis, 2001Triglycidyl isocyanurate (TGIC) is mainly used in polyester‐based powder paints, but also in laminates, insulating varnishes, coatings and adhesives. Several cases of contact allergy to TGIC have been reported during the last 10 years. Contact allergy to TGIC has developed in a factory producing the chemical, in a factory producing powder paints ...
U, Erikstam, M, Bruze, A, Goossens
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False-Negative Reaction to Patch Testing With Volatile Compounds
Archives of Dermatology, 1974To the Editor.— Recent experience with two patients illustrates what appears to be a specific type of falsenegative reaction to patch testing with volatile compounds. Report of Cases Case 1.— A 27-year-old white man was seen because of a four-day history of acute eczematous dermatitis of the dorsa of the hands and volar aspects of the wrists.
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Overcoming false negatives due to the genomic context in polymerase chain reaction amplification
Journal of Biochemical and Biophysical Methods, 1999In some instances defined genomic regions are so poorly amplified that they seem to be unamplifiable. A protocol was developed which allows good PCR amplifications by the use of restriction digestion combined with the elution of a pool of restriction fragments of defined size range from agarose gel after electrophoresis.
E, Baldrich, N, Xamena, O, Cabré
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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
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Pitfalls in Patch Testing: Minimizing the Risk of Avoidable False-Negative Reactions.
Dermatologic clinics, 2021Patch testing is the gold-standard diagnostic tool for the diagnosis of allergic contact dermatitis; unfortunately, it is a procedure with potential for errors, including false-negative reactions. Some of the factors responsible for this are likely unavoidable; however, others may potentially lie within the control of the user. Knowledge and management
Solveig, Ophaug +1 more
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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
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