Fentanyl Test Strips

The most sensitive, cost-effective, and accessible method for checking if your drugs contain fentanyl is by using Fentanyl Test Strips.
The test strips that we sell here at Dosetest are the most reliable on the market.
  • One use per strip
  • Tested by third party labs
  • Reacts to over 20 different Fentanyl variants

Tried & tested

Easy to use

Discreetly shipped

Live support

Quick shipping

Easy to use

Discreetly shipped

Live support

Quick shipping

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.

How it works in 3 steps

Use our app to receive personalised guidance on how to test your sample with your strip.

Mix up your sample and test it, following the steps in the app.

Key in the results so that we can help you interpret them.

What our customers think

Fast shipping.

Fast shipping. Test strips work great. I already recommended to friends. Great price too.


Genuine company

This company actually cares about their customers and their wellbeing and their service is great. Great people will buy from them again!


Great price, quick shipping, informative!
Well priced test kits, shipped quickly, and the website provided information for which test kits were best to have for which substances.
The shipping was shockingly fast. I ordered the Marquis reagent kit and it was nicely packaged and worked well. Absolutely no complaints, only compliments for dosetest. Highly recommend.
See more reviews..

Any questions?

Are there cheaper Fentanyl Test Strips elsewhere?

Dosetest is the cheapest provider, and it’s not by chance. We are committed to offering the most accessible tests, both by providing subsidized tests to charities and mutual aid orgs, and by offering you the lowest price on the market.

That’s why we offer our price match guarantee: if you (somehow) find a better deal elsewhere, just let us know. We won’t just drop our prices for you, we’ll reduce them for everyone.

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.
When will my order arrive?
To ensure that you get your order when you need it, we offer a range of shipping options from standard postal delivery to Overnight Express. As long as you place your order before 2PM EST on a working day, it’ll be shipped that same day!
Is the package discreet?
Orders are shipped either in plain brown boxes or padded envelopes, and the sender is marked simply as “DTEST” with no other information on the package which would indicate its contents.
Can I get help when testing?
Of course! In addition to the step-by step guidance in our app, you can contact us via the live chat on the bottom right of this page, by email or over social media.
How do I use the test strips?

We recommend you utilise our app, but we do have instructions below here.

1: Prepare your sample

Pills and powders: If testing a pill, break off a small chunk and crush it as finely as you can. If it’s a powder, chop it up and mix it as best you can. These strips are highly sensitive, so you only need about 5 milligrams (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 pretty 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 a little 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 nice clean 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 4 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, assuming that the sample DOES CONTAIN fentanyl.