Retesting process$-$This EQA method is used for HIV rapid testing. HIV rapid testing presents

some special challenges, because it is often performed outside a traditional

laboratory, and by persons who are not trained in laboratory medicine.

Additionally, the kits are single$-$use, and cannot be subjected to the usual

quality control methods that laboratories employ. Therefore, retesting of

some of the samples using a different process such as enzyme immunoassay

$($EIA$)$ or ELISA $($enzyme$-$linked immunosorbent assay$)$ helps to assess the

quality of the original testing.

Characteristically, the retesting is:

$$ done by a reference laboratory, to ensure quality;

$$ performed on dried blood spots or serum collected at the time of the

rapid test performance;

$$ not performed as a blinded process, as this is unnecessary.The number of samples retested must provide statistically significant data in

order to detect error. This becomes difficult in settings where small numbers

of rapid tests are performed. A full discussion of the statistical issues in

retesting is found in the CDC$/$WHO reference Guidelines for Assuring the

Accuracy and Reliability of HIV Rapid Testing: Applying a Quality System

Approach. List some MCQ with answers