Results 261 to 270 of about 6,203,398 (300)
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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
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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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European Journal of Clinical Microbiology & Infectious Diseases, 1997
The aim of this study was to assess the presence of inhibitors in urine specimens causing false-negative results in a commercial Chlamydia trachomatis gap-filling ligase chain reaction (Gap-LCR) assay. On testing of urine samples by the Gap-LCR assay and urethral swab specimens by cell culture, 73 (19%) Chlamydia trachomatis positive subjects were ...
E S, Berg +4 more
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The aim of this study was to assess the presence of inhibitors in urine specimens causing false-negative results in a commercial Chlamydia trachomatis gap-filling ligase chain reaction (Gap-LCR) assay. On testing of urine samples by the Gap-LCR assay and urethral swab specimens by cell culture, 73 (19%) Chlamydia trachomatis positive subjects were ...
E S, Berg +4 more
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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
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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
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Journal of Clinical Virology, 2003
Qualitative HIV-1 proviral DNA PCR tests have three main diagnostic applications. These include direct detection of viral sequences in the pre-seroconversion window period which may be positive up to 8 days prior to the development of HIV specific antibodies; resolution of indeterminate HIV serological tests and in the diagnosis of neonates born to ...
Philip, Cunningham +5 more
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Qualitative HIV-1 proviral DNA PCR tests have three main diagnostic applications. These include direct detection of viral sequences in the pre-seroconversion window period which may be positive up to 8 days prior to the development of HIV specific antibodies; resolution of indeterminate HIV serological tests and in the diagnosis of neonates born to ...
Philip, Cunningham +5 more
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The Pediatric Infectious Disease Journal, 2002
Diagnosis of HIV infection in early infancy generally relies on detection of HIV proviral DNA by PCR. However, many of the HIV DNA PCR assays currently in use are either not optimized or have not been validated for diagnosis of infection with non-subtype B HIV.
Nancy E, Kline +2 more
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Diagnosis of HIV infection in early infancy generally relies on detection of HIV proviral DNA by PCR. However, many of the HIV DNA PCR assays currently in use are either not optimized or have not been validated for diagnosis of infection with non-subtype B HIV.
Nancy E, Kline +2 more
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[The Schilling test in Biermer's disease, problems of false negative reactions. Apropos of a case].
Annales de medecine interne, 1988A case of pernicious anemia in a 30 years old men is described. This disease was typical for the hematologic, immunologic and medullary patterns, for his evolution, but the Schilling test, a dual tracer method, did not confirm the diagnosis. The contradictory of this result can be explained wether by the bias of the test itself, or by the intestinal ...
A, Devidas +4 more
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Italian journal of gastroenterology and hepatology, 1998
Polymerase chain reaction is widely used in clinical practice as a reliable assay for the detection and quantitation of hepatitis C virus RNA in serum and tissue. Due to the high sensitivity of the test, both false positive and false negative results can occur.
A, Colantoni +3 more
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Polymerase chain reaction is widely used in clinical practice as a reliable assay for the detection and quantitation of hepatitis C virus RNA in serum and tissue. Due to the high sensitivity of the test, both false positive and false negative results can occur.
A, Colantoni +3 more
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European Journal of Plant Pathology, 1995
A previously reported method for polymerase chain reaction (PCR) detection ofGaeumannomyces graminis was modified to simplify it, improve its specificity and decrease the possibility of contamination of the assay. The modified method also allowed discrimination between theG.
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A previously reported method for polymerase chain reaction (PCR) detection ofGaeumannomyces graminis was modified to simplify it, improve its specificity and decrease the possibility of contamination of the assay. The modified method also allowed discrimination between theG.
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Pediatric Allergy and Immunology
Abstract Background The frequency of false negatives in exercise provocation tests (EPTs) when evaluating exercise‐induced allergic reactions on desensitization (EIARD) remains unclear. This study aimed to determine the frequency of allergic symptom induction after a negative EPT result in ...
Motohiro Mukai +5 more
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Abstract Background The frequency of false negatives in exercise provocation tests (EPTs) when evaluating exercise‐induced allergic reactions on desensitization (EIARD) remains unclear. This study aimed to determine the frequency of allergic symptom induction after a negative EPT result in ...
Motohiro Mukai +5 more
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