Please ensure to visit official government website of the country you are travelling to, in order to familiarise with the most recent testing requirements, which may apply to you.
According to gov.uk, "Before boarding a flight to the USA, most passengers - regardless of vaccination status - are required to show a negative COVID-19 test result taken no more than 1 day before travel. All air passengers to the USA are also required to provide contact information to their airlines before boarding. You should check with your airline before you travel for more details. Full requirements for pre-travel testing can be found on the CDC website (https://www.cdc.gov/coronavirus/2019-ncov/travelers/noncitizens-US-air-travel.html). Children under 2 years old do not need to test."
Please see the below link for further information:https://www.gov.uk/foreign-travel-advice/usa/entry-requirements
Please note, as of the time this information was written (May 20th, 2022) our Telehealth Video-Supervised lateral flow tests are valid upon entry to USA.