Covid testing has come a long way since 2020. Back at the start of the pandemic, tests were unreliable and nearly impossible to get, but now most of us can find a same-day appointment at drive-thru testing sites across our states. Even better, we now have access to at-home Covid tests so, if you’re well-stocked, we don’t even have to leave the house to take a test. They’re useful — and sometimes required — for many things, like international travel or even simply attending a large event, like a wedding. These tests are incredibly convenient but in order to accurately read your test, it’s helpful to have pictures of positive Covid tests to use as a point of reference.

Are at-home Covid tests reliable?

Given that the virus itself is so new and still has so many unknowns, it’s fair to wonder whether or not at-home Covid tests are reliable. “Yes [at-home Covid tests are reliable], but as with all testing platforms they have advantages/disadvantages,” says Thomas Denny, a Professor in Medicine at the Duke Human Vaccine Institute at Duke University School of Medicine.

The best way to ensure that a negative result is correct is to keep testing, Denny says. “[False negatives] can be countered by repeat testing over a few days,” he explains, “Repeated negatives increase the certainty of a true negative.”

Antigen versus PCR: Different types of Covid tests available for at-home testing

There are two types of Covid-19 diagnostic tests that are FDA-approved for home testing: Rapid antigen tests and molecular tests. Rapid antigen tests tend to detect Covid when you’re carrying a lot of the virus. Molecular tests tend to be more sensitive, so they can detect Covid infection earlier than antigen tests can — from a few hours up to a few days faster. However, that accuracy and speed come with a price tag, and antigen tests are still an incredibly useful tool for detecting contagious Covid infection. It’s worth noting that Covid self-tests performed at home are not as reliable as those performed in a laboratory setting. However, if you have a positive result on either a rapid antigen or molecular test, you should trust that result, because false positives are very, very rare, says Denny.

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How and when to take a Covid test

“One of the biggest variables to all testing is to have a good quality swab process,” says Denny, so it’s extremely important to read and follow the directions that come in your at-home Covid test so that you can get an accurate result. As for when to take an at-home Covid test, there is no perfect answer. “When an individual turns positive is related to the specific variant, because they have different incubation periods, and how much exposure someone has had” Denny explains.

Your best bet is to take a test as soon as you start experiencing symptoms, or once you know you’ve been exposed. If it comes back as a false negative at that point, Denny says you’re “most likely not able to transmit [the virus] to others on that day.” However, don’t trust the negative result right away, wait another day or two and take another test (and possibly another a day or so after that one).

How will you know if the test is positive, though? Here are some photos of positive Covid test results to help you read your result.

“Testing is an important tool to limit infections to others and we need to continue to develop strong testing capacity in the U.S.” Denny reiterates. Using these photos of positive Covid test results as a point of reference can be very helpful in determining whether or not you’re positive for the virus. If you see any indication of a positive result — even a super faint second line — you should assume you have Covid and check in with your health care provider.

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Thomas Denny, MSc, MPhil, Professor in Medicine at the Duke Human Vaccine Institute at Duke University School of Medicine