What is the validity of the Polymerase Chain Reaction (PCR) certificate?

In the Pre-Departure COVID-19 Polymerase Chain Reaction (PCR) Swab Test setting, Polymerase Chain Reaction (PCR) memos are issued and dated on the day the result is made available from the laboratory. Depending on your destination of travel, the Polymerase Chain Reaction (PCR) certificate is typically valid for up to 72 hours.