Polymerase Chain Reaction (PCR) Test Topic Guide

Polymerase Chain Reaction (PCR) Test Polymerase Chain Reaction (PCR) Test: PCR (polymerase chain reaction) is technique in molecular genetics that analyzes short sequences of DNA or RNA. PCR is used to help doctors diagnose HIV, viruses, and fungi in patients. RT-PCR is a test used to detect and measure RNA -- as of June 2020, this is the standard test to diagnose the presence of the SARS CoV-2 coronavirus responsible for the deadly COVID-19 pandemic.