A test center for key workers at the Cardiff City Stadium was closed on a holiday Monday Monday, prompting criticism from opposition politicians.
Public Health Wales said this was due to the “low number of key workers expected to work” that day.
But Plaid Cymru chief Adam Price said the decision “begs belief”.
But the Welsh government has said opposition comments show a “lack of understanding” of how the system works.
Meanwhile, the Welsh Conservatives said there was no valid reason to close the center.
The Cardiff City Stadium center is one of four roadside testing centers planned to provide tests for key workers with symptoms – it is the only center operating so far, having opened last week.
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Health Minister Vaughan Gething promised 5,000 tests a day in mid-April – but publicly available data from Public Health in Wales shows daily test numbers have not exceeded 939 since Wednesday .
Figures from the Public Health Dashboard in Wales suggest that the level of daily testing has remained relatively stable for two weeks, hovering mostly between 800 and 900 since March 30, and falling to 507 on April 5.
In addition to key workers, people admitted to hospital with symptoms are tested separately. The Cardiff center has a capacity of 200 tests per day.
In a statement, Public Health Wales said full service at the center would resume on Tuesday.
“The decision to close the center was made due to the low number of key workers who are expected to work on the holiday Monday,” said PHW.
“For the sake of efficiency, it was therefore not deemed necessary to operate the test center that day. “
Plaid Cymru chief Adam Price said: “In a national public health emergency, when we are already testing far less than many other countries, it makes us believe that the Welsh government should see fit to close a test station for the holiday.
“We were promised that we would be 5,000 tests a day by mid-April. It is not surprising with this kind of approach that we have made absolutely no progress towards this figure so far. “
Welsh Conservative Health spokesperson Angela Burns said the decision was “incredible.”
“While I appreciate that the resources – especially the staff – are now at arm’s length, keeping the doors of a test center closed assuming that few key workers show up for testing is, I think, based on a false premise. “
The tests that weren’t done on Monday “will only add to the burden of testing that needs to be done and then analyzed,” she said.
A Welsh government spokesperson said, “This shows a complete lack of understanding of how workers in the system work. Key workers cannot simply come to this center, they must be reserved. “
“Due to the small number booked for today, they were all tested yesterday instead.
“The testing takes place in various locations and we now have the capacity to test up to 1,300 per day. “