There’s no single “best” at-home COVID test, but some stand out for availability, ease of use, and reliability. The FDA currently authorizes more than 30 over-the-counter home COVID tests, and all of them detect current variants. The differences come down to what you’re looking for: a basic rapid antigen test, a combo test that also checks for the flu, or the most accurate option you can use without visiting a lab.
Most Widely Available Tests
Three brands dominate pharmacy shelves and online retailers, largely because they were among the first authorized and have the broadest distribution networks.
BinaxNOW (Abbott) is the test most people recognize. It uses a shallow nasal swab, delivers results in 15 minutes, and comes in a two-pack designed for serial testing. It’s consistently stocked at CVS, Walgreens, Walmart, and Amazon. Flowflex (ACON Laboratories) is often the least expensive option per test and works similarly, with a 15-minute nasal swab format. QuickVue (Quidel) is sold under its own name and also rebranded as the CVS Health and Walgreens store-brand test kits, so you may already have one without realizing it. iHealth gained popularity during government free-test programs and remains widely available online, often at competitive prices.
All four of these are antigen tests. They work the same fundamental way: detecting viral proteins from a nasal swab sample. Performance differences between them are small enough that availability and price are the most practical deciding factors for most people.
Combo Tests That Check for Flu Too
If you’re sick during cold and flu season and want to narrow down the cause in one step, several FDA-authorized home tests now detect COVID-19, influenza A, and influenza B simultaneously. The Flowflex Plus COVID-19 and Flu A/B Home Test, the iHealth COVID-19/Flu A&B Rapid Test, and the CorDx TyFast multiplex test all do this from a single nasal swab. The Lucira by Pfizer COVID-19 & Flu Home Test goes a step further: it’s a molecular test, meaning it detects viral genetic material rather than proteins, which generally makes it more accurate than standard antigen tests.
Combo tests typically cost more, roughly double the price of a COVID-only antigen kit. But if you’d otherwise buy a COVID test and a flu test separately, the math works out.
Antigen vs. Molecular: The Accuracy Gap
The vast majority of home COVID tests are antigen tests. They’re fast, cheap, and good at catching infections when your viral load is high, which is also when you’re most contagious. Their weakness is early-stage infections: you can have COVID for a day or two before an antigen test picks it up.
Molecular home tests (sometimes called NAAT or PCR-style tests) detect the virus’s genetic material and are generally more accurate than antigen tests, especially in the first couple of days of infection. The Lucira by Pfizer is the most prominent molecular home test currently available. It costs significantly more than antigen kits, but if accuracy matters most to you, for instance before visiting a vulnerable family member, a molecular test is the stronger choice. Lab-based PCR tests remain the gold standard for accuracy, and they’re still covered by Medicare Part B at no cost to the patient.
How to Get the Most Accurate Results
A single negative antigen test doesn’t rule out COVID. The FDA recommends serial testing for all authorized home antigen tests: if you have symptoms, test at least twice with 48 hours between tests. If you don’t have symptoms but want to confirm you’re negative (before a gathering, for example), test at least three times over five days, spacing each test 48 hours apart. Two negative results with symptoms, or three without, gives you reasonable confidence.
Swabbing technique matters more than most people realize. A shallow, quick swab will miss virus that a thorough one catches. Rotate the swab inside each nostril for the full time specified in the instructions, usually 10 to 15 seconds per side. Some research suggests that combining a throat swab with a nasal swab improves detection, particularly for Omicron-lineage variants. A study of over 800 participants found that combined nose-and-throat sampling caught more infections than either site alone. However, most home test instructions only authorize nasal swabbing, so check your specific test’s directions before swabbing your throat.
What a Faint Line Means
A faint pink or purple line on the test strip counts as a positive result. This is one of the most common points of confusion. Any visible color on the test line, no matter how faint, means viral proteins were detected in your sample. A faint line does not necessarily mean you’re less contagious or have a milder infection. Line intensity can vary based on how much virus is in the sample, but it doesn’t reliably predict how sick you are or how infectious you might be. If you see a faint line and the control line is also visible, that’s a positive test.
Check Expiration Dates Carefully
If you have tests left over from a government distribution program or a bulk purchase, check whether they’re still usable. Many home COVID tests have had their expiration dates extended by the FDA beyond what’s printed on the box. The original printed date may say 2023 or 2024, but the actual authorized shelf life could be months longer. You can look up your specific test and lot number on the FDA’s website to find the current extended expiration date. Tests that are truly expired may give unreliable results, particularly false negatives, because the chemical reagents on the test strip degrade over time.
Cost and Insurance Coverage
Most home antigen tests cost between $8 and $15 for a two-pack at retail. Combo flu/COVID tests run $15 to $25. The Lucira molecular test is pricier, typically $30 to $50.
The federal free test programs and insurance reimbursement mandates that existed during the public health emergency have largely ended. Medicare Part B no longer covers over-the-counter home tests as of May 2023, though some Medicare Advantage plans still include them as a supplemental benefit. Check with your specific plan. Private insurance reimbursement varies by carrier and plan. If cost is a barrier, community health centers and some local health departments still offer free testing, though availability depends on where you live.
Which Test Should You Buy
For most situations, a widely available antigen test like BinaxNOW, Flowflex, or iHealth will do the job well, especially if you follow the serial testing protocol. Buy a two-pack so you can retest in 48 hours if the first result is negative. If you’re testing during flu season and want to know which virus you’re dealing with, pick up a combo test. If you need the highest accuracy you can get at home, before seeing an immunocompromised relative or making a medical decision, the Lucira molecular test is worth the extra cost. And regardless of which brand you choose, make sure it carries FDA emergency use authorization. All the tests on the FDA’s authorized list have met safety and performance standards. The “best” test is ultimately the one you’ll actually use correctly and, when needed, use twice.