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A positive result of a tuberculin test, also known as the Mantoux test, is indicated by the presence of induration (swelling) at the injection site, typically measured 48 to 72 hours after administration. The size of the induration varies based on individual risk factors; for example, a reaction of 15 mm or more is generally considered positive in healthy individuals, while smaller reactions may be significant in those with higher risk factors, such as recent exposure to tuberculosis or immunocompromised status.
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When a tuberculin skin test is positive the hard center and erythema surrounding the induration are a result of?
imune complexes
What does a positive Molisch's test on an unknown substance indicate?
A positive Molisch's test result indicates the presence of carbohydrates.
Name a nonfermentative test in which gas production indicates a positive test result?
The oxidase test is a nonfermentative test in which the presence of gas bubbles indicates a positive result. Gas bubbles result from the reaction of the test reagent with cytochrome c oxidase, which is present in certain bacteria like Pseudomonas species.
Which of the following cannot lead to a positive tuberculin skin test?
being near someone with tb
Tuberculin skin test for children?
The tuberculin skin test (TST), also known as the Mantoux test, is used to determine if a child has been exposed to the bacteria that cause tuberculosis (TB). A small amount of purified protein derivative (PPD) is injected intradermally, and the injection site is examined 48 to 72 hours later for induration (swelling). A positive result indicates exposure to TB but does not confirm active disease; further evaluation is necessary. It's important to consider the child's risk factors and history when interpreting the results.
What is a test result indicating that a condition is present when in fact it is not?
A false positive test result occurs when a test wrongly indicates the presence of a condition that is actually not present. This can lead to unnecessary further testing, treatment, or emotional distress for the individual receiving the result.
What is a false positive tuberculin skin test?
A false positive tuberculin skin test occurs when the test indicates that a person has been exposed to the tuberculosis (TB) bacteria, even though they are not infected. This can happen due to cross-reactivity with other mycobacterial infections, prior vaccination with the Bacillus Calmette-Guérin (BCG) vaccine, or other non-TB infections. False positives can lead to unnecessary anxiety and further testing, underscoring the importance of considering clinical context and additional diagnostic methods.
What is a false-positive?
A false-positive is a test result which incorrectly indicates that a particular condition or attribute is present. False-negatives can also occur.
How to interpret tuberculin skin test result in auto-immune disorders?
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What indicates a test for catalase production is positive?
A positive catalase test result is indicated by the presence of bubbles or effervescence when hydrogen peroxide is added to the test organism. This indicates the production of the enzyme catalase, which breaks down hydrogen peroxide into water and oxygen gas.
Is the DNA test result positive or negative?
The DNA test result is positive.
What is a positive test result for starch?
A positive test result for starch is the formation of a blue-black color when iodine solution is added to the sample being tested. This color change indicates the presence of starch in the sample.
