Notes in Common Lab Tests

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Published	09/15/2023	{{c1::sensitivity}} is calculated as the number of positive results you would get if you tested 100 patients known to have the disease = true {{c…
Published	09/13/2023	{{c1::Negative Predictive Value (NPV)}} = True negatives / True negatives + False negatives{{c3::Positive Predictive Value (PPV)}} = True positives / …
Published	09/13/2023	If the prevalence of the disease increases, a negative result is more likely to be a FN than a TN, so NPV {{c2::decreases::increases/decreases}}If t…
Published	09/11/2023	{{c1::positive predictive value (PPV)}} is probability that people with a positive test result truly have the outcome{{c2::negative predictive value (…
Published	09/13/2023	PPV increases with an increase in {{c1::prevalence}}{{c2::NPV}} doesn't really change much with changes in {{c1::prevalence}}at low disease preva…
Published	09/11/2023	if prevalence is low, PPV increases when the {{c1::specificity::specificity/sensitivty}} of the test increases
Published	09/13/2023	ancillary testing facilitates developing a {{c1::differential}} diagnosis → {{c1::refined}} diagnoses
Published	09/13/2023	{{c1::60-70::range}}% of medical decision making is based on results of testing
Published	09/13/2023	Role of testing after diagnosis- prognostic: predict how disease will behave- predictive: predict which therapy may work, subset of prognostic- monito…
Published	09/13/2023	reference ranges for tests- aka. “reference intervals” or “normal ranges” - established by testing a population of individuals without {{c1::disease}}…
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