AT&T; LTE 12:53 AM Test 2.docx A best that determines whether disease is actuall

Question

AT&T; LTE 12:53 AM Test 2.docx A best that determines whether disease is actually present is a Gagnostic test reliability te creening test of the choices 2.5 points Drs. Poke and lab (2014) conducted an employee health program that used 5 screening tests at the ame time to detect diseases among workers. Which type of program is ths Selective screening b Ad hoc screening Manis screening d. Mubipharsic screening 2.5 poines A new ar body test detects serum antbodies against vns x esenstvity 99%, specificity 904 when applied in a group of hospitalzed patients diagnosed as having virus X infections, the best is found to have a positive predictive value of 85% When used to screen a group of healthy blood donors for virus X infectona, the test is found to have a poseve preditve value of 30%.whichofthe foliowing best explains this diflerence between the pasitive predictive values? Measurement error was introduced into the procedure b. Cases of wirus X infection are more severe in the hospital . Lead time bias occurs among the blood donors d· The prevalence of virus X infection îshigher among the hospital patients than among blood 2.5 pains

Explanation / Answer

Ans-25. Diagnostic Test

A diagnostic test is any approach used to gather clinical information for the purpose of making a clinical decision (i.e., diagnosis). Some examples ofdiagnostic tests include X-rays, biopsies, pregnancy tests, medical histories, and results from physical examinations.

Ans-26. multiphasic screening

MULTIPHASIC SCREENING - It has been defined as the application of two or more screening tests in combination to a large number of people at one time than to carry out screening tests for single diseases.

Ans-27. The answer to this question would be D. The prevalence of virus X is higher in hospital patients than among blood donors. This is because positive predictive value increases as prevalence increases. Since the hospital patients are known to have virus X, they have a higher prevalence of the virus than the healthy blood donors not known to have the virus.

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