I frequently get questions about the home COVID tests that are now available at local pharmacies. I’ll answer the most common questions below.
PCR tests are the “gold standard” for COVID testing, typically are run through a lab, and produce results in 1-3 days. One is now available for home testing!!
Lucira Check It COVID-19 Test Kit, which uses PCR, gives results in 15-30 minutes. According to the manufacturer website, it is 98% sensitive. It can be purchased directly from Lucira’s website for $75. The test is able to detect alpha, beta, delta, gamma, lambda, mu and omicron variants of the virus
** THESE QUESTIONS REFER TO ANTIGEN TESTS WHICH ARE THE MOST COMMON **
· Are they any good? They are about 85-90% sensitive, meaning they will pick up COVID infection 85% of the time. That also means they’ll miss COVID infection 15% of the time. These tests are sold in boxes of two tests because if you take 2 tests, 24 hours apart, the sensitivity improves to about 95%.
· If they’re only 85-90% sensitive, are they even worth doing? Yes. Because they are readily available and inexpensive, it allows easy testing in many situations. For example, if everyone tests prior to arriving at your home for Christmas Dinner, you’ll pick up 85-95% of asymptomatic infected people. That’s better than picking up none!
· If I test positive, do I really have COVID? YES. False positive tests, (a test that’s positive when you actually don’t have COVID) are extremely rare. So, if you test positive, you have COVID and should isolate yourself.
· If I test negative, am I sure I don’t have COVID? NO. Remember, the tests are not perfect. A single test misses 15% of cases. 2 tests taken 24 hours apart miss around 5% of COVID cases. If you test negative, still use common sense and wear a mask in high-risk situations, practice social distancing, and wash hands frequently.
· When should I take a home COVID test? They’re useful in several situations: In the first 6 days of symptoms they are very good at picking up COVID in symptomatic people. If you’ve been exposed to someone with COVID – 3 to 5 days after exposure. If you’re going to a gathering with several people who are not in your household, the testing will provide some reassurance that infected people are not at the event. Personally, I am asking all 21 people coming to my house for Christmas to take a test prior to coming for dinner.
· Which test is best? ConsumerLab has reviewed many of the currently available tests:
BinaxNow Self Test
iHealth – more false negatives than most of the others
BD Veritor – somewhat pricey, slightly more false negatives, requires an App
On/Go – the most false negatives of any test. Expensive.
AccessBio CareStart – same as On/Go, sold through Target at lower cost.
InteliSwab – least expensive but least accurate. Hard to find in local stores
Ellume – no longer seems to be on the market since it had a massive recall in October.
· Will these tests pick up Omicron? Yes. All these home tests focus on the nucleocapsid antigen, so they should be able to pick up the Omicron variant.
· Are they expensive? CVS currently has BinaxNow box of 2 tests for $14 if you sign up for their frequent shopper program (free). Walmart also sells this test for around $14.
· Will insurance pay for home tests? Maybe. Currently, it’s hit or miss. However, President Biden has mandated that insurance cover the cost of home testing starting January 1.
· Will being vaccinated change the results of a home test? No. Being vaccinated gives you antibodies. These tests are NOT testing for antibodies. They’re testing for antigen – a piece of the virus itself.