Hospitals should use spare laboratory space to test NHS staff in England for coronavirus who are self isolating, Health Secretary Matt Hancock has said.
The advice comes as the government faces growing criticism over a lack of testing for frontline staff.
There is frustration that self-isolating staff could return to work if tested and cleared of having the virus.
On Tuesday, Cabinet Office minister Michael Gove admitted the UK had to go "further, faster" to increase testing.
Testing so far has been focused on patients, though NHS England has told hospitals to use up to 15% of their testing capability on staff, if this is possible.
Mr Hancock has now urged hospitals to go further and test as many staff as they can, with health officials saying laboratories have the capacity to take on more tests.
The government has been repeatedly criticised for having said in recent weeks that testing was a priority, but then not implementing it for frontline NHS workers.
Ministers have announced plans to work with the private sector and universities to scale up testing, but Mr Gove acknowledged the government had more to do.
Speaking at the government's daily coronavirus briefing, he said: "More NHS staff are returning to the front line, and more testing is taking place to help those self-isolating come back, and to protect those working so hard in our hospitals and in social care.
"But while the rate of testing is increasing, we must go further, faster."
The Royal College of Physicians this week said as many as a quarter of doctors are off work because they are having to self-isolate – either because they are showing symptoms or a member of their household is.
A fifth of nurses have been affected, the Royal College of Nursing said, while the British Medical Association said staff began being tested over the weekend, but only in low numbers.
BMA chairman Dr Chaand Nagpaul said: "It's been well over two weeks since the government said it was going to roll out priority testing for healthcare staff.
"But many doctors still have no idea about where or how they can get tested."
Conservative former Health Secretary Jeremy Hunt said it was "very worrying" that the government had not introduced mass testing.
He said it had been the key to finally controlling the outbreak in Wuhan, the Chinese city where the disease first appeared.
"It is internationally proven as the most effective way of breaking the chain of transmission," Mr Hunt said.
"However difficult it is to source the reagents to ramp up the capacity of laboratories up and down the country, it is essential that mass community testing is part of our national strategy."
Mr Gove said at the press briefing that the ability to increase testing capacity was being hampered by the availability of the chemicals needed to test patients.
He said Prime Minister Boris Johnson and Mr Hancock, who are both self-isolating after testing positive for Covid-19, were working with companies worldwide to get the materials needed.
The Chemical Industries Association acknowledged demand was "escalating" but said reagents were being manufactured and delivered to the NHS.
"Every business here in the UK and globally is looking at what they can do to help meet the demand as a matter of urgency," it said.
"To clarify the exact NHS need and meet it, all relevant UK industries are continuing to work closely with government."
On Tuesday, it emerged that 13-year-old Ismail Mohamed Abdulwahab, from Brixton in south London, died after testing positive for coronavirus.
He is thought to be the youngest reported victim of the disease in the UK.
His family, who said they were "beyond devastated" by his death, said IsmRead More – Source