New Digital Platform Technology Aims to Disrupt 50-Year-Old PCR Testing for COVID, Flu, Lyme, HIV & Many More.

Patented nanotechnology in a handheld device detects multiple infections at the same time from a single saliva sample in minutes. Products are set to hit the market in 2022.

This SEC-qualified offering has been prominently endorsed by Angels + Entrepreneurs

Test Cartridges for Multiple Pathogens

How is Check4™ different from other tests?

Check4™ is a highly accurate, over-the-counter self-testing system that is fast, accurate and affordable. It detects early and asymptomatic infections with the accuracy of a PCR test, but without reagents, diagniostic machines, technicians and delays.
This electronic-based platform uses newly developed nanosensors, saliva and a user’s smartphone to provide nearly instant results for multiple infections — anywhere, anytime.

Fast & Accurate Saliva Self-Test

Commercialized in partnership with Purdue University

Half the price of PCR tests with nearly instant results

Results displayed
in minutes

iOS & Android

Protected by
5 patents

Fast & Accurate Saliva Self-Test

Commercialized in partnership with Purdue University

All New Nanosensor Technology

Results Available
in Minutes

iOS & Android

Protected by
5 Patents

woman on phone wearing a covid-19 mask
woman on phone wearing a covid-19 mask

Multiplex Testing

IdentifySensors Biologics and some of the world’s leading researchers at Purdue University have commercialized a new and disruptive nanosensor technology that rapidly detects multiple pathogens, including influenza, mumps, measles, MRSA, Hep C & B, HIV, foodborne pathogens and more.
woman on phone wearing a covid-19 mask


The Check4™ platform is the technological breakthrough that will soon move medical testing beyond antiquated chemistry and into the digital era. Current chemical-reaction tests will be replaced by fast and affordable digital nanosensors that connect to a smartphone. Soon, consumers will be able to test themselves daily, even on the go if needed, with highly accurate results in minutes. Businesses and organizations will have the ability to remotely monitor employees and customers in real time.

The benefits of accurate, over-the-counter testing include immediate results without a doctor’s visit or prescription; fast, easy access; more frequent testing; earlier detection; lower costs; reduced transmission rates; and improved population health.

woman on phone wearing a covid-19 mask
woman on phone wearing a covid-19 mask

Results In Hand

To use the test, download the smartphone app and complete the form. Place saliva into the reader. Minutes later, test results appear on your smartphone. That’s it. The reader was developed to be used more than 20,000 times by multiple people and different test cartridges for multiple infections.



A highly accurate and affordable over-the-counter testing platform for smartphone

Check4™ — A portable self-test with accuracy rates on par with a PCR test. A nanosensor cartridge analyses saliva to produce a highly distinguishable electronic signal for positive or negative results that are sent to a smartphone in minutes. Tests are being developed for COVID and other infections, including Flu A, Flu B, HIV and MRSA.
Check4™ meets the gold-standard in molecular testing. Clinical tests show a 99 percent accuracy. Using nanosensors avoids the limitations of enzymatic reactions, amplification, sample preservation and sample transportation, which can introduce artifacts and raise the risk of false positives.
Check4™ is anticipated to cost significantly less than a PCR test. This approach avoids expensive chemicals used by laboratory-based molecular tests, such as enzymes and reagents that are in short supply. It also eliminates the need for laboratory technicians, diagnostic machines and personal protective equipment.
New nanosensor technology intends to disrupt the medical diagnostics industry by enabling consumers, businesses and governments to perform rapid accurate testing for a multitude of infections, anywhere, any time.

How does Check4™ work?

A user receives a reusable reader and downloads the free smartphone app. Single-use test cartridges can be purchased as well, for infections such as COVID, influenza and other pathogens. A saliva sample is placed in the cartridge and signals are sent to the reader for processing. Test results are transmitted to a smartphone in minutes, anywhere, anytime. The test intends to be as accurate as PCR tests, but without cost and logistical barriers.
Results Appear in Minutes on Your Smartphone – anywhere, anytime:

  • No nasal swabs
  • No delayed results
  • No prescriptions
  • No doctor visits
  • No laboratories
  • No chemical enhancements or reagents
  • No waiting in lines
  • No mailing in samples
  • No high costs