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The White House is offering 4 more free Covid tests. Here's how best to use them.

Each household is eligible for four at-home tests this winter, which will be mailed to homes starting the week of Dec. 19.
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A home Covid-19 test.Jean Chung / Bloomberg via Getty Images

The third holiday season since the pandemic started is underway, and more than 400 people are still dying of Covid every day, on average, according to NBC News' tally. Average daily cases have risen nearly 45% in the last two weeks.

To combat the virus' spread, White House officials announced Thursday that each household can order four free at-home tests. The tests will be mailed directly to homes starting the week of Dec. 19.

The Biden administration had suspended the program in September due to a lack of funding. But on a call with reporters, a senior administration official said the White House is using money from the Covid stimulus bill passed last year to pay for the additional tests.

“We’re seeing Covid cases rising in parts of the country following Thanksgiving. And while Covid isn’t the disruptive force it once was, we know that the virus will circulate more quickly and easily as folks gather indoors for the winter holiday season,” the official said.

The Biden administration is also distributing rapid tests to food banks and low-income housing programs for seniors, the official said. And the White House has asked governors to set up more Test to Treat sites, which allow some people who test positive for Covid to receive antivirals like Paxlovid at little to no cost.

Here's how to get tests without paying out of pocket, check when an at-home test expires and interpret a negative result if you have symptoms or known exposure.

How to get free tests from the government

On the website, click on "Order Free At-Home Tests," then fill out your address on the form and check out. Each household is eligible for one shipment of four tests.

Private insurance and Medicare still cover eight at-home tests per month

Since January, the Biden administration has required private insurers and Medicare to cover up to eight at-home tests per month.

People with private insurance can order the tests at in-network pharmacies or submit claims to be reimbursed for tests they buy at other stores or out-of-network pharmacies. People with Medicare can search online for a list of providers that offer free tests.

PCR lab tests are also fully covered through private insurance and Medicare.

How to find free testing sites near you

Some sites that provided free rapid or PCR tests earlier in the pandemic have closed, but the Department of Health and Human Services has an online search tool to find nearby sites still offering free or low-cost tests. Most are pharmacies like CVS and Walgreens, but the site can also direct you to your state health department's website, which may offer additional options.

Once the government’s public health emergency declaration expires, testing costs will probably go up

The declaration was last renewed in October, and it could end sometime in 2023. After that, Medicare beneficiaries will most likely have to pay the full cost of at-home tests but should still get clinical diagnostic testing covered, according to KFF, a nonprofit health think tank. For people with private insurance, testing costs will be subject to the particulars of their plans, but they are unlikely to be covered in full.

Rapid tests can expire, but many shelf lives have been extended

Different tests have different shelf lives, but many of the original expiration dates have been extended since the tests were authorized.

In such cases, the manufacturer has provided evidence to the government that the tests give accurate results longer than was known when they were created. 

To check whether the expiration date of your particular test has been revised, click on the relevant link on the Food and Drug Administration’s list and look up the lot number.

Abbott’s BinaxNOW at-home test, for example, says it has a shelf life of 15 months, but the expiration dates of many batches have been extended by three to six months. The tests from iHealth Labs sent in the prior government shipments last one year, but most of their shelf lives have been extended four to six months.

When to test if you've been exposed or feel ill

If you have symptoms, take a test immediately. If you were exposed to someone who tested positive but you feel healthy, test after five full days.

The FDA recommends that people with known exposures who test negative take second tests 48 hours later. If they are negative again, test a third time after another 48 hours.

"We know antigen-based tests, you have to repeat them. They're not a one-and-done test," said Dr. Susan Butler-Wu, an associate professor of clinical pathology at the University of Southern California.

If you are exposed within 30 days after having previously tested positive for Covid, you don’t need to test unless you develop symptoms, according to the Centers for Disease Control and Prevention. If it has been less than 90 days since your last Covid infection, use a rapid test, because PCR results can stay positive for up to 12 weeks.

You can report your at-home test result to public health agencies at, a site from the National Institutes of Health.

What to know about the accuracy of at-home tests

PCR tests are generally more sensitive and accurate than at-home tests, but the results can take at least 24 hours. At-home tests (also known as antigen tests), meanwhile, rarely give false positives but can give false negatives, even if someone is symptomatic. That's especially likely in the early days of an infection.

Scientists aren't sure why that is, but one theory is that the immune response leads to symptoms before the virus has a chance to replicate to detectable levels. That may cause people to feel tired, achy or sniffly before they test positive.

For other people, Covid tests never come back positive even though they feel sick and were exposed to the virus. It's possible that those people have unrelated infections or their immune systems did a swift job of vanquishing the virus before it replicated widely enough to register on a test.

People who are elderly or immunocompromised should seek out PCR tests if they feel sick or were exposed to Covid and get negative results on at-home tests, said Dr. Sheldon Campbell, an associate professor of laboratory medicine at the Yale School of Medicine. That's because those groups are eligible for treatments like Paxlovid in the days after they test positive.

"You don't want to wait two days, get a positive and realize you should have been treating for two days," he said.

Your test result could be a good indicator of contagiousness

Campbell said testing positive on an at-home test is a pretty good indicator you're infectious. But Butler-Wu cautioned that it’s still possible to be contagious and test negative on an at-home test or to test positive and not spread the virus to others.

"At the end of the day, there is no infectiousness test for Covid. There has never been, and there still isn't," she said.

It is well established, however, that people are more likely to be infectious at the start of their illnesses. An August study found that 65% of people with Covid shed infectious virus five days after their symptoms started but that just 24% were still doing so after a week.

How long you're likely to test positive

If you are mildly ill, the CDC recommends isolating for at least five days after your positive test or the start of symptoms, then ending isolation if you test negative or if symptoms have resolved or are clearing up. If your symptoms haven’t improved much or you still have a fever on day five, the agency advises continuing isolation until you are fever-free for 24 hours without medication.

People with moderate or severe illness — characterized by shortness of breath or hospitalization — should isolate through day 10.

"Typically, people are positive for about seven days after their symptoms" start, Campbell said. "Some people can go longer — rarely more than two weeks."

In one small study, just 25% of people with Covid were negative on rapid tests on day six of their illnesses, but all the participants tested negative after two weeks. In a study of college athletes with Covid, meanwhile, 27% still tested positive one week after their first positive tests.