Results 271 to 280 of about 5,583,624 (329)

[Interpretation and relevance of patch testing: false-positive and false-negative test reactions, compound allergy, cross-sensitivity].

Annales de dermatologie et de venereologie, 2009
This chapter reviews pitfalls and mistakes in patch testing. Most sources of false-positive and false-negative reactions are indicated and analysed. Cross-sensitivity among allergens is discussed and compound allergy is debated. Keys for establishing relevance are indicated, for a better reading and interpretation of patch testing by practitioners ...
C J, Le Coz, D, Sasseville
openaire   +3 more sources

Pitfalls in Patch Testing: Minimizing the Risk of Avoidable False-Negative Reactions.

Dermatologia clinica, 2020
Patch 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.
Solveig Ophaug, K. Schwarzenberger
semanticscholar   +1 more source

False-negative oxidase reaction as a result of medium acidification

Antonie van Leeuwenhoek, 1980
Acidification of the culture medium may lead to a false-negative result of the oxidase reaction. Hence, if the medium contained a carbon source or another component that is convertible to acid, a negative oxidase reaction should be considered inconclusive.
Havelaar, AHrivm, Hoogendorp, CJ, Wesdorp, AJ, Scheffers, WA   +3 more
openaire   +3 more sources

False negative hyperglucosuria test-strip reactions in laboratory mice

Laboratory Animals, 1982
Inhibition of a variety of commercial test strips for hyperglucosuria was experienced in laboratory mice. All mouse strains tested were found to have sufficiently high levels of ascorbic acid to cause inhibition, and male levels were higher than those of females. A regime to obtain optimum detection of positive results is discussed.
Taylor, D M, Neal, D L
openaire   +2 more sources

Degradation of triglycidyl isocyanurate as a cause of false‐negative patch test reaction

Contact Dermatitis, 2001
Triglycidyl 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
openaire   +2 more sources

Overcoming false negatives due to the genomic context in polymerase chain reaction amplification

Journal of Biochemical and Biophysical Methods, 1999
In 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
openaire   +2 more sources

Light-Chain Proteinuria: Spurious False-Negative Reaction to Sulfosalicylic Acid

Annals of Internal Medicine, 1985
Excerpt 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, MICHAEL R. MURNANE, WILLIAM D. KUEHL, LEE A. HEBERT, JOHN C. NEFF, WILLIAM H. BAY   +5 more
openaire   +1 more source

False-Negative Reaction to Patch Testing With Volatile Compounds

Archives of Dermatology, 1974
To 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.
openaire   +1 more source

Pitfalls in Patch Testing: Minimizing the Risk of Avoidable False-Negative Reactions.

Dermatologic clinics, 2021
Patch 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, Kathryn, Schwarzenberger   +1 more
openaire   +1 more source

[False negative reactions in the serodiagnosis of cystic echinococcosis in humans].

Immunitat und Infektion, 1985
Clinically supposed cases of echinococcosis can be strongly confirmed by application of serodiagnostic techniques. In certain cases false-negative reactions have to be taken into account. This has been observed in 4 out of 51 parasitologically confirmed cases.
K, Janitschke, H, Werner, L, Thomas
openaire   +1 more source