Rapid tests do not always detect Omicron — here's how to know for sure if you've got COVID or not



A rapid COVID-19 test is being processed.

If you take rapid tests when your viral load is low, they will work on Omicron.

You need to reach a certain threshold before any test can detect your infection.

Taking at least two rapid tests is recommended by experts.

A quick test for COVID-19 is simple to administer and ready within minutes.

The federal government will distribute half a billion free COVID-19 tests across the country in 2022, and will reimburse over the counter pharmacy kits starting in January, so many people will use free rapids next year.

If you don't perform rapid tests in the right way, they won't give you accurate results. Some experts have expressed surprise at how infectious Omicron is, with symptomless, vaccine-free people infecting others days before a rapid test detected their infection.

The FDA and the UK have found that rapid tests still work. They have to be taken at the right time, and ideally, performed multiple times over the course of a few days for the very best results.

If you want to test cheaper and smarter in the new year, here's a primer on the best ways to do it.

You can't always trust a result in the first couple of days.

If you test yourself too early, you'll get a negative test even if you've got COVID-19.

"If you've been exposed, you should get tested right away," Susan Butler-Wu, who directs clinical testing for infectious diseases at the University of Southern California, told Insider. If you got exposed, there's no need to do that.

When your viral load is high, rapid tests are designed to give positive results in a few days. During that time, you may or may not have symptoms of Omicron, which can include cough, fatigue, and a sore nose.

Michael Mina, chief science officer at e Med, said during a call with journalists on Tuesday that he would probably quark himself if he were to get the disease. I would take the test tomorrow and then take the second test a few days later.

If your first test is negative, it's possible that you already have spread the Omicron variant around.

Tim Spector, who runs the highly-regarded ZOE COVID study in the UK, told Insider that he was surprised to find that Omicron seems to move much faster than Delta.

When your COVID-19 test is positive.

The data he collected on the birthday party of fully vaccineed adults suggests that someone can be exposed to Omicron and spread it to other people in just 48 hours.

By the time people know they have it, they may have spread it.

He says that it's a good argument for keeping holiday parties small, and that it makes track and trace pretty impossible.

A negative rapid test does not necessarily mean you are safe to mingle mask-free.

"If I have less virus, but now I'm sitting in a room with no windows open, in close proximity to someone who's unvaccinated, I may still be infectious," she said. I can still transmit even though I might be less infectious.

If you've been exposed, you should be isolated for a few days.

The best time to administer a rapid test is between 3 to 5 days after exposure to COVID-19. The waiting period will give you enough time to recover from your illness, which will make the test more effective.

A two-pack is the most common form of rapid tests. Take one immediately after your symptoms start, and save the other for a few days after, according to the package instructions.

She says that if the test actually calls for it, you shouldn't randomly start swabbing various things like your throat.

Mina said he's already canceled his holiday travel plans because of the high incidence of Omicron. Don't be afraid, you don't have to be very worried about it, just assume it's Omicron andQuarantine. You can take another test at that point.

Experts still recommend waiting a few days for the test to detect the virus.

In general, higher-quality lab tests for COVID-19 pick up lower levels of the virus more readily than rapids do.

They can detect the virus earlier in the course of your infection, and generally, they can turn positive a day before a rapid test.

It's best to wait several days after exposure to make sure you get an accurate result.

"If you do it at day five, that's pretty good," he said.

Because of their enhanced sensitivity to the virus's genetic material, the tests will stay positive for a long time, even after a person feels better, and they may continue to detect the virus for several weeks after a person feels better.

"People like to say it's a false positive, but it's not a false positive, it's a long tail on the test positivity," she said. "We're still detecting remnants of the virus in a way that we don't detect with the rapid test."

If you are going to mingle, rapid test as you arrive.

A health department in Livingston, Montana, performed a rapid COVID-19 test.

Scientists are still trying to figure out when people are most likely to be infectious. The experts stress that an old-fashioned, common sense approach to disease prevention is the best way to go.

Mina said to not go for the holidays if you're sick. "Assume a person is positive."

You can't protect yourself from the virus while you're there if you get a negative test before the event.

Mina said to cut down on holiday travel this year if you can, and keep any gatherings small, because it only takes one person to spread a lot of diseases. If someone is breathing on me in that party, I won't become positive.

A negative test doesn't always mean you're safe.

She said that it's not an infectiousness test. A rapid test that shows you what's going on in your nose at that moment is just one of many factors that can affect how well the disease spreads.

One layer of risk reduction.

Mark Barsoun helps his 4-year-old with the swab for a rapid COVID-19 test in Palos Verdes Estates, California, on August 24, 2021.

The good news is that the tests seem to identify the new variant well when timed right. The coronaviruses neucleocapsid is a single-syllable, four-syllable piece of code.

The Food and Drug Administration has indications that rapid antigen tests are decent at detecting all of the circulating coronaviruses, but rapids aren't perfect.

"It needs to be seen as one layer of reducing risk, rather than it being the layer that eliminates risk, which is sometimes, unfortunately, how I think it's portrayed," he said.

Business Insider has an original article.