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Fentanyl Test Strips by Dosetest With just a strip and a few minutes you can identify Fentanyl, protecting yourself and your friends from the dangers of a toxic drug supply. 1 use per strip Tested by 3rd party labs Reacts to 20 different fentanyl variants What exactly are Fentanyl Test Strips? This type of test is called a “lateral flow competitive immunoassay”, and it’s pretty much the reverse of a rapid COVID test or pregnancy test. The strip is pre-loaded with “control particles” and when you dip it into your sample, the water carries these particles along with the drug towards the testing lines. If there’s no fentanyl the control particles will bind to the testing line, causing it to become visible, but if there is then the fentanyl will bind instead and the line won’t appear.