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Variable Barcodes to Boost COVID-19 Test Kit Experience

Scannable point of care tests were designed to increase test accuracy, collect data, and take the guesswork out of reading results.

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Many consumers who’ve had the experience of purchasing at-home health tests have been faced with “faint line” confusion. Does it count? Is it even a line? They purchase the device looking for answers and end up more unsure.

Israel-based Varcode is looking to improve lateral flow test kits with technology intended to take the guesswork out of reading results by offering a scannable barcode. Though barcodes are typically static, Varcode, which also has offices in the U.S., has developed a method of changing a barcode based on a sensor, making it dynamic and scannable. (Varcode stands for “variable barcode”).

Yaron Nemet, chief technology officer and director of Israeli operations, explains, “It's relatively easy to take a barcode and make it unreadable. But it's difficult to take one readable state and to move it into a different readable state. We’re accomplishing this using time and temperature sensor to change the barcode.”

 Varcode is now at work on applying this technology in a rapid flow test (RFT) for a COVID-19 sensor.

Rapid flow test

The RFT kit consists of lateral flow assay (LFA) inside of a housing (see image). The assay contains a certain protein that demonstrates the virus painted with gold, and the existence of antibodies in the blood plasma will tie to the protein and cause a color change in the form of a line.

Pic 1With Varcode’s Smart Tag technology, the LFA remains the same—the changes are the  additional printed opaque layer added on top of the LFA and the viewer scanning experience. The actual test kit itself, approximately the size of a credit card, is composed of plastic and is similar to what you would see in a pregnancy test on the market today.

Once the sample is collected, the patient follows the prompts in the mobile app, scans the Smart Tag(s) when instructed, and the information is automatically sent to the secure cloud. The mobile app processes the data, shares it with approved health agencies and/or doctors, and returns results and/or instructions to the patient.


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The manufacturer can also choose to obscure results from patients to prevent self-diagnosis or self-treatment. In these cases, the test can be performed from the comfort of home with physician-defined automated return messaging sent to the patient through the app.

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