This article will be updated regularly.

The coronavirus pandemic has sparked a rush for private companies to offer ways for people to test themselves for the virus from their own homes.

But there’s a lot of empty claims, hype and scams that consumers need to beware of — as well as crucial information that will help understand them how and why to avoid these fake tests.

The most important thing to know is that the FDA has not yet approved any at-home diagnostic tests or at-home collection kits for the coronavirus. There are also no at-home antibody tests currently approved by the FDA.

Here’s a look at how tests work, and what you need to know about them.

How do coronavirus tests work?

Most U.S. coronavirus tests require a swab taken from the back of the nasal cavity or the throat, which is then tested for the presence of the virus’s RNA. A positive result means that person is currently infected with the virus.

These tests are done by public health labs as well as major commercial labs that can conduct large-scale testing.

A different kind of test determines whether someone has previously been infected with the coronavirus. Called serological tests, these look for blood antibodies — proteins produced by the immune system’s response to the virus.

Some companies are pushing at-home sample collection, in which people swab themselves and then send their sample in to get tested in a lab. This method can work, but is prone to error because samples can easily be collected incorrectly or tainted during shipping.

What about at-home test kits?

Many companies have touted that they are working on at-home kits, but they should be viewed with scrutiny, particularly since none have been approved by the FDA yet.

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Some companies have worked to create kits that allow people to swab themselves at home and then mail their sample to a lab that can process their test. The FDA has also not approved any at-home collection tests, according to Kelly Wroblewski, director of infectious disease at the Association of Public Health Laboratories, which represents state and local governmental health laboratories in the United States.

What about antibody tests?

Serological tests use small amounts of blood, usually from a finger prick, to test whether a person was previously infected with the coronavirus by looking for antibodies.

Antibodies are created by the human immune system to fight off foreign invaders, like the coronavirus. A positive result does not mean a person is currently infected; it can only tell whether someone was infected in the past.

And because it takes the body several days after being infected to develop antibodies, a test given too early could come back negative, even if someone has the virus.

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Antibody tests are still in development, though some companies have made outlandish claims. The FDA said in a recent statement that more than 70 test developers have told the agency they have serological tests available, but warned that many of these developers are falsely claiming their products have FDA approval or authorization.

Currently only one company — Cellex — has an FDA-approved serological test for coronavirus, though it is not for at-home testing.

Antibody tests could become increasingly important as localities try to figure out just how much of its population has already been infected — and how many could still be susceptible to the virus.

How does the FDA fit in here?

The FDA is the governmental body that oversees testing, which falls under its edict of regulating medical devices.

FDA approval for new tests can take months and even years, Wroblewski said.

But in emergency situations, such as the coronavirus pandemic, the FDA can issue “emergency use authorizations,” in which the process is sped up.

What about claims of FDA approval?

The FDA has issued 37 approvals for tests for the detection of the virus and one approval for an antibody test as of April 9. Most of these approvals have been given to major testing companies and university labs. These are labs where collected samples can be properly tested.

None of those companies have been approved for at-home testing or at-home collection.

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