Army personnel have been drafted in to run dozens of mobile coronavirus testing units which can be sent across the UK.
The facilities are set to be deployed to care homes, police stations and prisons to screen key workers and vulnerable people where there is "significant" demand.
The units take less than 20 minutes to set up, the Department for Health and Social Care says, and can test hundreds of people each day.
It comes as the Government is under pressure to ramp up Covid-19 testing with a target to hit 100,000 a day by next Thursday.
The new units, designed by the army's Royal Engineers, are vehicles which have been refitted to become testing sites.
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Specially trained military personnel will collect swabs and then send them to "mega-labs" for processing.
Results are expected to be available within 48 hours.
Home Secretary Priti Patel told the Downing Street daily briefing on Saturday that 28,760 tests were carried on Friday.
Eight mobile units are already carrying out tests across the country, in areas including Salisbury, Southport and Teesside.
However, the Department of Health says "at least" 96 will be ready by the start of May, following a pilot last week.
The army will be staffing 92 of the units, while civilian contractors will operate a further four located in Northern Ireland.
The mobile sites will also be used to test frontline workers in the fire and rescue service and at benefits centres.
Defence Secretary Ben Wallace said: "Our armed forces will help deliver testing to where it's most needed, using a network of up to 96 mobile units that will be rolled out in the coming weeks.
"They will make sure our care sector get the testing required to remain in the front line of the fight against this pandemic."
National testing coordinator Professor John Newton added: "New mobile testing units will help us achieve our goal of 100,000 coronavirus tests a day, providing tests to vital frontline workers wherever they need them.
"In a matter of weeks, we have worked with Britain's leading scientists, academics and industry partners to build scores of new testing facilities and Britain's largest network of diagnostic labs in history."
