STEP 3 - How to Read the Result

Use a bright light. You can use the torch on your phone.

One red line on top is a POSITIVE result. There is fentanyl in your sample.

Two red lines is a NEGATIVE result. The lower line could be significantly lighter than the upper red line. If you can see it at all, it is still negative, even if it is faint and you needed to use a light.

No red lines, or one red line on the bottom, means the test didn’t work. This usually happens because the liquid did not travel far enough up the test strip. Try using another test, and double-check the above tabs to make sure you haven’t missed anything.