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Developed by UNIADS/WHO for use in confirming initial HIV positive tests
maximizes accuracy while minimizing high cost associated with Western Blot but retaining similar predictive values to Western blot and others.
Three testing strategies recommended by UNAIDS/WHO
Strategy used depends on purpose of the test and the prevalence of HIV in the population
The strategy used works on the principle of using two screening tests either in parallel or sequentially
Report sensitive Consider +ve A +ve -ve specific B +ve -ve sensitive A +ve -ve Report Indeterminate Report sensitive C +ve -ve + - - Low risk A +ve -ve sensitive specific B +ve -ve Report Report TRANSFUSION TRANSFUSION SURVEILLANCE DIAGNOSIS DIAGNOSIS I II III WHO HIV antibody testing strategies + - + High risk Sensitivity >97% Specificity >95% SERIAL TESTING PARALLEL TESTING