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  2. Widal test - Wikipedia

    en.wikipedia.org/wiki/Widal_test

    This differentiation of antibody classes is important as it allows for the distinction of a recent (IgM) from an old infection (IgG). The Widal test is positive if TO antigen titer is more than 1:160 in an active infection, or if TH antigen titer is more than 1:160 in past infection or in immunized persons. A single Widal test is of little ...

  3. Antinuclear antibody - Wikipedia

    en.wikipedia.org/wiki/Antinuclear_antibody

    An ANA test is considered positive if fluorescence is seen at a titre of 1:40/1:80. Higher titres are more clinically significant as low positives (≤1:160) are found in up to 20% of healthy individuals, especially the elderly. Only around 5% of the healthy population have ANA titres of 1:160 or higher. [8] [53]

  4. Reference ranges for blood tests - Wikipedia

    en.wikipedia.org/wiki/Reference_ranges_for_blood...

    References range may vary with age, sex, race, pregnancy, [10] diet, use of prescribed or herbal drugs and stress. Reference ranges often depend on the analytical method used, for reasons such as inaccuracy, lack of standardisation, lack of certified reference material and differing antibody reactivity. [11]

  5. p-ANCA - Wikipedia

    en.wikipedia.org/wiki/P-ANCA

    p-ANCA is associated with several medical conditions: [3] It is fairly specific, but not sensitive for ulcerative colitis, so is not useful as a sole diagnostic test. [4] When measured together with anti-saccharomyces cerevisiae antibodies (ASCA), p-ANCA has been estimated to have a specificity of 97% and a sensitivity of 48% in differentiating patients with ulcerative colitis from normal ...

  6. Titer - Wikipedia

    en.wikipedia.org/wiki/Titer

    Titres are sometimes expressed by the denominator only, for example 1:256 is written 256. [3] The term also has two other, conflicting meanings. In titration, the titer is the ratio of actual to nominal concentration of a titrant, e.g. a titer of 0.5 would require 1/0.5 = 2 times more titrant than nominal. This is to compensate for possible ...

  7. Low levels of biomarker could predict heart disease risk in ...

    www.aol.com/low-levels-biomarker-could-predict...

    Higher antibody levels associated with lower CVD risk. The women with the highest levels of IgM anti-PC had a 73% lower risk of CVD than those in the group with the lowest levels. The reduction ...

  8. Anti-dsDNA antibodies - Wikipedia

    en.wikipedia.org/wiki/Anti-dsDNA_antibodies

    This assay can be quantitative or semi-quantitative, allowing for estimations of the levels of anti-dsDNA antibodies. This test can produce false positives due to contamination of ssDNA from denatured dsDNA. EIA detects low and high avidity anti-dsDNA antibodies, increasing its sensitivity and reducing its specificity. [1]

  9. Anti-streptolysin O - Wikipedia

    en.wikipedia.org/wiki/Anti-streptolysin_O

    A positive test usually is > 200 units/mL, [1] but normal ranges vary from laboratory to laboratory and by age. [2] The false negatives rate is 20 to 30%. [1] If a false negative is suspected, then an anti-DNase B titre should be sought. False positives can result from liver disease and tuberculosis. [1]

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