Can a COVID-19 test taken before departure from the US be used to return within the 1-day or 3-day time frame?

Can a COVID-19 test taken before departure from the US be used to return within the 1-day or 3-day time frame?

If a trip is shorter than 1 day, a viral test taken in the United States can be used to fulfill the requirements of the Order as long as the specimen was taken no more than 1 day before your return flight to the U.S. departs. If your return travel is delayed longer than 1 day after the test, you will need to be retested before your return flight. If you are considering this option, you should additionally consider, as a contingency when making your travel plans, the availability of testing capacity at your destination and the time frame needed to obtain results.