• occur
  • IgG allergies are difficult to diagnose because reactions do not occur until hours or days after ingestion of an allergen. (askdrthomas.com)
  • The strip is then left to stand for the time necessary for the reactions to occur (usually 1 to 2 minutes), and finally the colours that appear are compared against the chromatic scale provided by the manufacturer. (wikipedia.org)
  • Although complications during anaesthesia are rare, potentially life threatening consequences may occur if an anaphylactic reaction develops. (wikipedia.org)
  • However, when the serum is diluted, the blocking antibody is as well and its concentration decreases enough for the proper precipitation reaction to occur. (wikipedia.org)
  • Francisella tularensis, Escherichia coli, Salmonella urbana, Yersinia enterocolitica, Vibrio cholerae, and Stenotrophomonas maltophilia) the appearance of cross-reactions of class M immunoglobulins may occur. (wikipedia.org)
  • With nontreponemal tests, false-positive reactions can occur for a large number of reasons, the most common of which is other infections, both viral and bacterial. (wikipedia.org)
  • antibodies
  • Examples include high levels of syphilis antibodies in HIV patients or high levels of cryptococcal antigen leading to false negative tests in undiluted samples. (wikipedia.org)
  • Demonstration of antibodies against the agent either with the classic Huddleson, Wright, and/or Bengal Rose reactions, either with ELISA or the 2-mercaptoethanol assay for IgM antibodies associated with chronic disease Histologic evidence of granulomatous hepatitis on hepatic biopsy Radiologic alterations in infected vertebrae: the Pedro Pons sign (preferential erosion of the anterosuperior corner of lumbar vertebrae) and marked osteophytosis are suspicious of brucellic spondylitis. (wikipedia.org)
  • antigen
  • In a Type III delayed hypersensitivity reaction, IgG forms an immune complex with the allergen/antigen (Ag), which activates the complement pathway and releases inflammatory mediators wherever the immune complex is deposited. (askdrthomas.com)
  • yields
  • The test involves placing a faecal sample on guaiac paper (containing a phenolic compound, alpha-guaiaconic acid, extracted from the wood resin of Guaiacum trees) and applying hydrogen peroxide which, in the presence of blood, yields a blue reaction product within seconds. (wikipedia.org)
  • patients
  • In 7 of the 28 pN+ patients (25%), metastases were also detected in non-SLN, thus giving a false-negative rate (FNR of 38.9% (7/18), a negative predictive value (NPV) of 61.1% (11/18), and an accuracy of 82.1% (32/39). (biomedsearch.com)
  • None of these six research groups to report negative findings - which in the case of the UK included Professor John Gow, Dr Jonathan Kerr and Dr Jonathan Stoye and used patient samples from physicians including Dr Abhijit Chaudhuri and Professor Peter Behan - have been able to find XMRV in blood samples from ME/CFS patients, or in the healthy controls. (meassociation.org.uk)
  • In plasma, elevation of hydroxy-C18:1 acylcarnitine over the 95th centile of controls, in combination with an elevation of two of the three acylcarnitines C14, C14:1 and hydroxy-C16, identified over 85% of patients with high specificity (less than 0.1% false positive rate). (umassmed.edu)
  • However, their usefulness is limited by decreased sensitivity in early primary syphilis and during late syphilis, when a large number of untreated patients will be negative by these methods. (wikipedia.org)
  • quantitative
  • There are strips which serve different purposes, such as qualitative strips that only determine if the sample is positive or negative, or there are semi-quantitative ones that in addition to providing a positive or negative reaction also provide an estimation of a quantitative result, in the latter the colour reactions are approximately proportional to the concentration of the substance being tested for in the sample. (wikipedia.org)
  • species
  • A 3-10% solution of potassium hydroxide (KOH) gives a color change in some species of mushrooms: In Agaricus, some species such as A. xanthodermus turn yellow with KOH, many have no reaction, and A. subrutilescens turns green. (wikipedia.org)
  • tests
  • Blood tests characteristically reveal a low number of white blood cells and red blood cells, show some elevation of liver enzymes such as aspartate aminotransferase (AST) and alanine aminotransferase (ALT), and demonstrate positive Bengal Rose and Huddleston reactions. (wikipedia.org)
  • allergy
  • For example, whey protein is altered by high heat, so someone with a whey allergy may have no reaction to heat-altered milk products. (askdrthomas.com)
  • The severity of the reaction whilst under anaesthesia is due to the fact that the anaesthetist is only made aware of the allergy when it is severe enough to compromise the cardiovascular system and the respiratory system. (wikipedia.org)
  • show
  • 15% of guinea pigs must show a reaction for the test to be considered positive. (wikipedia.org)
  • I felt that referencing them in Daria, while we were trying to establish the new characters and the different type of humor, ran the risk of setting up false expectations and disappointment in the viewers - which could lead to a negative reaction to the new show and its different tone. (wikipedia.org)
  • rate
  • Our hypothesis is that the intervention group will have less variability as measured by mean deviation between exams and greater reliability as measured by the standard unreliability indexes of false positive rate, false negative rate, and fixation losses. (clinicaltrials.gov)
  • often
  • Paper strips are often specific to a single reaction (e.g. pH measurement), while the strips with pads allow several determinations simultaneously. (wikipedia.org)
  • initial
  • Thrombosis and subsequent recanalization of a ruptured intracranial aneurysm in 2 children, demonstrating the value of repeating catheter angiography after an initial negative study. (biomedsearch.com)
  • The cases of 2 children with true aneurysmal subarachnoid hemorrhages (SAHs) and initial false-negative angiograms are reported. (biomedsearch.com)
  • immediate
  • IgE production occurs right after ingestion or inhalation of an allergen and is referred to as a Type I immediate hypersensitivity reaction. (askdrthomas.com)