(CNN)Two giant signs at a White House press conference amplified a claim that President Donald Trump consistently makes:
"AMERICA LEADS THE WORLD IN TESTING"
"We've prevailed on testing," Trump said Monday, standing between the signs.
While the US may have performed the most number of coronavirus tests, it's nowhere near the world's leader in testing per capita, multiple studies show.
And health experts say the US isn't close to the rate of testing needed to safely reopen the economy.
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How many tests have been done?
By May 12, the US had conducted about 9.6 million tests, according to the COVID Tracking Project.
As of May 11, the US has performed an average of 28.24 tests per 1,000 people, according to researchers from Oxford University.
It's important to note some individuals have received multiple tests. For example, Vice President Mike Pence cited his frequent testing as a reason why he chose not to wear a face mask.
Pence says he should have worn a mask at the Mayo Clinic
Public health experts say we don't need to test every American right now. But they say the US still isn't conducting enough tests to stop the spread of the virus enough to safely reopen the economy.
The Harvard Global Health Institute said the US should be testing at least 900,000 people a day by May 15.
"This is due to a growing consensus among experts that the US is faring worse in this outbreak than previously thought," the institute said. "Social distancing measures have been able to stall the sharp increase of infection and death rates -- but unlike in many other nations, new cases are only very slowly decreasing."
On Monday, Trump said the US is conducting about 300,000 tests per day.
How does the US stack up against other countries?
A coronavirus test can be developed in 24 hours. So why are some countries so far behind?
There's no single definitive ranking system because there are variations in how some countries report their testing.
"The number of tests does not refer to the same in each country -- one difference is that some countries report the number of people tested, while others report the number of tests (which can be higher if the same person is tested more than once)," the Oxford researchers said on their website OurWorldInData.org.
So CNN looked at different rankings, and each study showed that many other countries have higher per capita testing rates.
The independent data aggregation site Worldometer said the US had the highest raw number of test completed as of May 12. But at the same time, the site's data showed, more than 30 countries were ranked higher than the US in per capita testing.
As of April 26, the US ranked 22nd in the number of tests performed per capita, according to the Organization for Economic Co-operation and Development (OECD).
Fact check: Trump falsely claims, again, that anybody who wants a test can get one
FactCheck.org, a project of the Annenberg Public Policy Center at Trump's alma mater, the University of Pennsylvania, said Trump's April claim about the US testing more than "every country combined" was "way off."
"The U.S. total is indeed more than any single country has reportedly done -- but not more than all other countries combined," FactCheck.org said.
"Adding together just the number of tests conducted by Russia, Germany and Italy -- the next three countries that have done the most testing -- would produce a higher figure. ... So, Trump's claim is not even close to being accurate."
Republican senators say testing is still insufficient
Lawmakers have urged the administration to keep ramping up testing to help states allow businesses and schools to open.
"All roads back to work and back to school run through testing. And that what our country has done so far on testing is impressive, but not nearly enough," Republican Sen. Lamar Alexander of Tennessee said Tuesday.
US health labs may never be able to meet demand for coronavirus testing over supply chain shortages
Sen. Mitt Romney, a Utah Republican, questioned the administration's touting of conducting more tests than South Korea, including more tests per capita than South Korea.
But South Korea got the virus under control much earlier in its outbreak, thanks to prompt, widespread testing. The US was much slower, due in part to faulty test kits.
And while South Korea has kept its Covid-19 deaths under 300, Romney noted, the US death toll is more than 82,000 and climbing.
"I find our testing record nothing to celebrate whatsoever," Romney said. "The fact is (South Korea's) test numbers are going down, down, down now because they don't have the kind of outbreak now. Ours are going up, up, up, because they have to."
CNN's Matthew Hilk, Jeremy Herb, Lauren Fox and Daniel Dale contributed to this report.
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