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Glossary Term
A WHO assessment that confirms a diagnostic meets quality, safety, and performance requirements for procurement by UN agencies and many national programs. WHO PQ status is frequently a tender eligibility criterion for public-health deployment in low- and middle-income countries.
Glossary Term
A study that compares two groups of people: those with the disease or condition under study (cases) and a very similar group of people who do not have the disease or condition (controls). Researchers study the medical and lifestyle histories of the people in each group to learn what factors may be associated with the disease or condition. For example, one group may have been exposed to a particular substance that the other was not. Also called retrospective study.
Glossary Term
A research study that compares a particular outcome (such as lung cancer) in groups of individuals who are alike in many ways but differ by a certain characteristic (for example, female nurses who smoke compared with those who do not smoke).
Glossary Term
A WHO procedure that time-limits the listing of diagnostics (and other health products) for use in public-health emergencies when full prequalification is not yet available.
