Pcr

They used an RT PCR assay to study the genome of the coronavirus.

The amplification of DNA via PCR is a necessary step for many kinds of tests.

Tom won't let anyone in his house who hasn't had a negative PCR in the last three days.

Tom and Mary got PCR tests.

Rapid tests are convenient, but there is still a possibility of false positives or false negatives, and they cannot fully replace PCR testing.