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There are several diagnostic tests for hepatitis C, including HCV antibody enzyme immunoassay (ELISA), recombinant immunoblot assay, and quantitative HCV RNA polymerase chain reaction (PCR). [16] HCV RNA can be detected by PCR typically one to two weeks after infection. In contrast, antibodies can take substantially longer to form and thus be ...
Due to the possibility of false positives, positive test results are usually reported as "reactive." This indicates that the assay reacted to antibodies, but this does not mean that the individual has the specific antibodies tested for. [5] Seroreversion is the opposite of seroconversion.
The false positive rate (FPR) is the proportion of all negatives that still yield positive test outcomes, i.e., the conditional probability of a positive test result given an event that was not present. The false positive rate is equal to the significance level. The specificity of the test is equal to 1 minus the false positive rate.
Cured of hepatitis C, however, doesn’t mean immune. Hepatitis C is not a one-and-done illness like, say, chickenpox. If you engage in the same behaviors that led to your hepatitis C infection ...
Mar. 14—Hepatitis C is a liver infection caused by the hepatitis C virus. It is becoming a big public health concern in many counties, including Lawrence County, encouraging us to review some ...
Cross-reactivity, in a general sense, is the reactivity of an observed agent which initiates reactions outside the main reaction expected.This has implications for any kind of test or assay, including diagnostic tests in medicine, and can be a cause of false positives.
In fact, post-test probability, as estimated from the likelihood ratio and pre-test probability, is generally more accurate than if estimated from the positive predictive value of the test, if the tested individual has a different pre-test probability than what is the prevalence of that condition in the population.
“In general, for all diagnostic tests, the lower the prevalence of infection in the community, the higher the proportion of false positive test results.” Put another way, false positive ...