Dosetest Fentanyl Strip
We recommend using the Dosetest Fentanyl Test app for accurate results which are customised to the type of substance you are testing: https://dosetest.com/fentanyl-app/ They also have a 24/7 online chat to answer questions which might not be covered here. You can take photos of your test results and have them confirmed by professionals within minutes over the live chat.
We recommend testing your entire sample for safety. It takes a tiny amount of fentanyl to cause an overdose. If you have fentanyl contamination, some parts of the sample will contain it and others won’t. Think of it like a chocolate chip biscuit: the biscuit is the sample and the chocolate chips are the Fentanyl. You can break off a small piece to test, but if there isn’t a chocolate chip in it you will get a false negative. The below instructions are for testing part of the sample but also apply to testing the entire sample.
1: Prep your sample.
Pills and powders: If testing a pill, break off a small chunk and crush/grind it as finely as you can. If it’s a powder, chop it up and mix as best you can. These strips are highly sensitive, so you only need about 5mg (think a couple of grains of salt). Put this into a cup, add 5mL (about a teaspoon) of water and mix them together. Fentanyl dissolves easily, so don’t worry if there is some residue after you’ve stirred it a bit – that won’t affect the results.
(Note: MDMA and methamphetamine can cause false positives. To avoid this, add an extra 4 tsp water to the sample so that it is more diluted. IPPH and DPH can also cause false positives, but are far less common).
Liquid: If you’re prepping a shot, do that first – the residue left in the preparation container is all you need. Add about 5mL of water (about a teaspoon), then put the mix into a cup. If it’s in a vial/bottle, shake it and put a drop into a cup, then add the teaspoon of water and mix.. If you are testing a pressed tablet or pill, using a clean knife, break off a small part and crush it into a powder. If your substance is already in the form of a powder, mix it as thoroughly as possible.
2: Running your test.
Take the strip out of its packaging, then dip the end with the wavy lines into your sample for about 15 seconds. Once that’s done, place it horizontally on a clean dry surface and wait for up to 3 minutes for your results to appear.
3: Interpreting your test.
Since there are 2 lines which would either appear or not appear, there are 3 possible results. The line nearer the end that you dipped is the Test line, and the line nearer the handle is the Control line.
Control line visible, Test line invisible: This is a positive result, which indicates that your sample DOES contain fentanyl.
Control line visible, Test line visible: This is a negative result, which indicates that your sample DOES NOT contain fentanyl.
Control line invisible: Regardless of what the Test line does, this means that something has gone wrong and the result is inconclusive – we don’t know if your sample contains fentanyl. We advise repeating the test or, if that isn’t possible, assume that the sample DOES CONTAIN fentanyl.
4. Recovering your sample post-testing.
Slow: Pour the liquid onto a clean, flat surface (e.g. a dinner plate). If you have a fan, set it up in the room to speed up the evaporation process. Check on the liquid once or twice per day. When there is no more liquid, scrape the remaining crystal/powder residue into a bag. This process will not affect the potency of the sample.
Fast: Heat the liquid sample in a saucepan on a very low heat until the water evaporates. Don’t let it boil! Scrape the remaining crystal/powder residue into a bag. When instructions are followed correctly, this process will not affect the potency of the sample.
