Population characteristics: Prevalence Sometimes more than one diagnostic test is conducted to increase overall test sensitivity or specificity. For example, disease eradication programs may necessitate multiple diagnostic tests to ensure that an animal is not infected or diseased (a false-negative … Continue reading
Disease Probability Probability is the chance that some event will happen. With disease, probability can be thought of as out a group of individuals exposed to a disease, how many will become infected. Diagnostic tests do not always appropriately classify … Continue reading
Population characteristics: Prevalence Prevalence is an estimation of an individual’s risk of having a disease at a specific point in time. Apparent prevalence, or the proportion of test-positive individuals at a specific point in time, is found after performing a … Continue reading
Principles of Diagnostic Testing Series Part 2 – Test Characteristics: Infectious Disease Antigen and Antibody Testing Some of the most common diagnostic tests for infectious diseases detect either antigens or antibodies. An antigen is a foreign substance that elicits an … Continue reading
Principles of Diagnostic Testing Series Part 1 – Test Characteristics: Sensitivity and Specificity The performance characteristics of a diagnostic test influence the circumstances that the test is most useful and how the results might be interpreted. Ideally, every diagnostic test … Continue reading
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