Our Testing Philosophy

At SafeFun, we focus on safety. Safety means being in a room where everyone has a recent, reliable, verified, negative test result. No one can guarantee that a room will be COVID-19 free, but we work to greatly reduce the risk. We believe the path back to normalcy is through frequent, rapid testing with a focus on contagiousness.

When a person is not contagious, that person is not a threat to us. That’s what we do at SafeFun. We analyze a variety of COVID-19 test results to determine conservative safe “windows” of time that our users can be in public and not a threat to others.

We are not epidemiologists. We rely upon the experts at the CDC, FDA, NIH and others to provide conservative guidelines around safety. We use those guidelines in our algorithms to provide safe spaces.

Test Types and SafeFun Windows

COVID-19 tests can be broken down into three main categories – Molecular, Antigen and Antibody. Detailed information on each type and their usefulness is well described by the FDA on the following page.


Molecular – Often referred to as NAA (Nucleic Acid Amplification) with the most frequent kind being at RT-PCR (Reverse Transcription Polymerase Chain Reaction), these are the gold standard in determining a true negative diagnosis for COVID-19. These tests are available with same-day and next-day results. Because it is possible for someone to contract COVID-19 immediately after taking a test, we grant a 48 hour window from the time of the test.

Antigen – These tests look for a particular variety of immune response. They are reliable in determining positive infection but not reliable in determining negative. However, they are reliable in determining the window of contagiousness. We conservatively grant a 24 hour period for negative antigen tests.

Antibody – Antibody tests are not reliable to determine the current state of infection. They are only reliable in determining the presence of COVID-19 antibodies. The combination of an antibody test followed by a negative molecular test indicates the person has antibodies and is completely clear of the infection. Current research indicates this provides a window of 90 days or more. Because we are conservative in our approach, we allow a 30 day window from the date of the positive antibody test. We anticipate the ability to increase this window based on the level of antibodies tested but we are waiting on more specific guidance to do that.

Test Results

We have to be able to trust the test results for this to work. We clearly can’t simply take someone’s word for their results. For that reason, we only use verifiable test result formats.

Today, we support test results in PDF format as well as results returned from automated, web-based systems. Each format and laboratory is different.

We have developed an intelligent system to read any variety of PDF and HTML test results, validate those results and match them to the user to ensure the test result is valid and that the submitting user is the actual person who took the test. We do this to combat fraudulent submissions and ensure safety.


Our early focus was on the largest testing companies to ensure early, broad reach. Our current initiative is to support the remaining hundreds of labs across the country. Even if your lab isn’t supported today, by submitting your test result, it goes into our work queue so that we can validate the laboratory, analyze the result format and integrate its format into our system.

If you work for a laboratory that provides COVID-19 testing and would like SafeFun to support your tests, please contact us in the form below.

Laboratory Contact

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