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Rapid antigen tests are faster and convenient for home use; PCR tests, a type of NAAT, are more likely to detect SARS-CoV-2. A single negative antigen result does not rule out infection. Choose based on how quickly you need an answer, how important diagnostic confidence is, and whether you recently had COVID-19.
How antigen tests and PCR tests differ
Antigen tests detect proteins from the virus. PCR tests detect viral genetic material and are one kind of nucleic acid amplification test (NAAT). CDC says NAATs, including PCR, are more likely to detect the virus than antigen tests. CDC testing overview CDC clinical overview
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| Decision point | Rapid antigen test | NAAT, including PCR |
|---|---|---|
| What it detects | Viral proteins (antigens). | Viral nucleic acid; PCR is a NAAT method. |
| Typical result time | Usually 15–30 minutes, according to CDC guidance. | Lab-based tests may take up to three days; point-of-care NAATs may be quicker. |
| Detection | Less likely than most NAATs to detect infection, especially without symptoms. | More likely than antigen tests to detect the virus. |
| Access | Self-tests are available for home use and through online and retail sellers. | Often collected by a provider and sent to a lab, though some tests are performed at the point of care. |
CDC describes NAATs as the “gold standard” for COVID-19 tests, while noting that antigen tests are less likely to detect infection, particularly in people without symptoms. CDC testing guidance
How to interpret an antigen result
A positive result
CDC says positive antigen results are accurate and reliable. CDC testing overview Follow the product instructions and contact a healthcare provider if you may be eligible for treatment or need advice about your circumstances.
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A negative result
One negative antigen test cannot rule out infection. CDC cites FDA recommendations to take two antigen tests 48 hours apart if you have symptoms, or three tests 48 hours apart if you have no symptoms. Follow the specific test’s instructions; a NAAT may be an alternative when a more reliable diagnosis matters. CDC testing overview CDC self-testing guidance
Which test should you choose?
Choose an antigen test for a quick home answer
An authorized at-home antigen self-test is practical when speed and convenience matter. CDC says these tests usually return results in 15–30 minutes. Treat a negative as preliminary and use the product’s repeat-testing schedule rather than relying on one result.
Rank #2
- FDA Authorized 15-Minute Self-Test: The test is a 15-minute self-test to detect whether or not an individual has COVID-19. The test can be completed in the comfort of your own home without the need to ship your sample to a lab.
- Easy to Use with Zero Discomfort: Test can be done by inserting 1/2 to 3/4 inch of a simple non-invasive nasal swab. Step-by-step instructional videos are available in our app (Installation of app is optional).
- For Ages 2 and Above : The self-administered test is recommended for individuals aged 15 years and older. Adult-collection is required for testing children 2-14 years old.
- Manage Group Testing Via Mobile App: The iHealth Test app allows the administrator of a small group to monitor and track the group members’ test results as needed at school, work or an event.
- Independently-sealed packaging ensures safe and hygienic testing. The swabs and test cards of iHealth COVID-19 Antigen Rapid Test are sealed and independently packaged to ensure the safety and hygiene of the product.
Consider a NAAT when confidence matters
A NAAT, such as PCR, is a reasonable option when a more reliable diagnosis is important, including after a negative antigen result when symptoms or circumstances leave concern. A clinician or testing site can advise whether a lab-based or point-of-care test is available. Lab turnaround may be up to three days, while point-of-care NAATs can be faster. CDC testing overview
If you tested positive in the past 90 days
NAATs may continue to detect viral material for up to 90 days after infection. This interval describes possible detection, not how long a person is infectious. Reinfection can still occur during that period, so a positive NAAT may need to be interpreted in light of the timing of your prior infection. CDC recommends antigen testing in the relevant symptom scenarios for people with a positive test in the past 90 days; consult its current guidance or a clinician if you are unsure which scenario applies. CDC testing overview CDC clinical overview
Rank #3
- FDA EUA AUTHORIZED & HSA / FSA ELIGIBLE – This at-home COVID-19 rapid antigen test is FDA Emergency Use Authorized to detect COVID-19 and its latest variants. Eligible for HSA/FSA reimbursement, making it a convenient and cost-effective testing solution.
- TRUSTED ACCURACY & RELIABILITY – With over 45 million INDICAID tests sold across 30+ countries, the INDICAID COVID-19 test is trusted worldwide for its precision and accuracy.
- CONVENIENT & EASY TO USE – Designed for on-the-go testing with a compact package perfect for travel, school, work, and home. Requires only a shallow nasal swab and can be completed in four simple steps.
- FAMILY FRIENDLY FOR AGES 2+ – Self-administered for individuals 15+, while children aged 2-14 require adult assistance.
- Use It Before the Expiration Date on the Label.
When to seek care promptly
If you are at higher risk of severe illness and develop symptoms or test positive, contact a healthcare provider promptly. Treatment for eligible people needs to begin within a few days of symptom onset. CDC outpatient guidance advises using a NAAT such as PCR when possible to support a reliable diagnosis without delaying treatment. CDC treatment guidance
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where to find testing
At-home antigen tests may be sold online and in pharmacies or other retail stores. Community testing may also be available through pharmacies, health centers, or local health departments. Availability and cost vary by location, so check local options and the package’s authorization, expiry information, and current instructions before using a home test. CDC’s clinical overview gives approximate 2024 cost ranges of $75–$100 per NAAT and $5–$50 per antigen test; these are not current quotes for a particular provider or retail product. CDC clinical overview
Quick Recap
Best Value
- Fast Results in 10 Minutes – Get reliable Covid-19 test results in as little as 10 minutes, perfect for quick checks before gatherings or travel.
- Easy to Use, No Lab Needed – Simple step-by-step instructions allow you to self-administer the test at home with no need for professional assistance.
- Detects All Major Variants – Effectively identifies all known Covid-19 variants, giving you confidence in the test’s ability to track evolving strains.
- Compact and Travel-Friendly – Conveniently sized for travel, this kit allows you to test anywhere, giving you the flexibility to stay safe on the go.
- Only 5 turns per nostril —why bother with 10? Get quick and reliable results with less effort, making testing easier for the whole family, Our Covid-19 test kit for home works for individuals ages 2+.
Rank #4
- # 1 At-Home COVID Test Supplier: Trusted by millions of families, with over 1 billion tests delivered nationwide through the federal government’s free COVID-19 test program during pandemic.
- FDA 510(k) Cleared 15-Minute Self-Test: The test is FDA 510(k) cleared and can be used as a 15-minute self-test to detect whether or not an individual has COVID-19. The test can be completed in the comfort of your own home without the need to ship your sample to a lab.
- Detects Multiple COVID-19 Variants: The test is designed to detect multiple COVID-19 variants, helping you stay informed even as the virus evolves.
- Easy to Use with Minimal Discomfort: The test can be done by inserting 1/2 to 3/4 inch of a simple non-invasive nasal swab. Step-by-step instructional videos are available in our app (Installation of the app is optional).
- For Ages 2 and Above: The self-administered test is recommended for individuals aged 15 years and older. Adult-collection is required for testing children 2-14 years old.
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