Test of synthetic cannabinoids type K4, or "UR-144"

Synthetic Cannabinoids K4 (or "UR-144") urine test

Urine test for the detection of synthetic cannabinoids type K4, also called UR-144.

K4 is the third type of synthetic cannabis to have appeared on the market.

Reference NCE-K4-1S
Test type Urine
Cut-off (detection level) 25 ng/ml
Maximum detection time 1 to 3 days after the last intake
Results in 5 minutes
Reliability Excellent (≈99%)
Manufacturer NarcoCheck®
Quantity Unit price
From 1 to 2 tests $4.90 per test
From 3 to 9 tests $4.50 per test
From 10 to 19 tests $3.90 per test
From 20 to 30 tests $2.90 per test
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Total: $4.90 Tax included

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About this test

The NarcoCheck® K4 rapid test strip is an immunoassay for fast the detection in human urine of synthetic cannabis of type "K4". This synthetic cannabis is now also known as UR-144.

Synthetic cannabis has nothing to do with natural cannabis. It is actually an active chemical and artificial substance. It is called "cannabis" because it mimics natural cannabis by acting on the same receptors of the organism, namely the CB1 and CB2 receptors.

Its chemical composition is completely different from natural cannabis, and as such, synthetic cannabis must be screened with a test specific to it, just like any other drug.

This test will detect the main molecule of K4, the UR-144.

Quick and easy to use

Description of the test device
Dipping the test
Result: negative
Result: positive
FAQ

What is the difference between the K4, K3 test and the K2 test?

There are 3 types of synthetic cannabis:

  • The K4, or UR-144, is a third type of synthetic cannabinoids, which has been on the market since 2014-2015.
    It is this form of synthetic cannabis that this test detects.

  • The K3, or AB-PINACA, is the second type of synthetic cannabinoids, which has been on the market more and more since 2014-2015.
    There is a specific NarcoCheck urine test for K3 (AB-Pinaca).

  • The K2, or Spice. It was the first type of synthetic cannabis to appear in the mid-2000s. It is still widely found in various seizures made around the world.
    There is a specific NarcoCheck urine test for K2 (Spice).
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Sensitivity / Specificity

Cut-off Details

NarcoCheck® - Synthetic Cannabinoids K4 (or "UR-144") urine test
Acronym : K4
Cut-off (sensitivity) : 25 ng/ml
Specificity :
Compound Cut-off (ng/ml)
UR-144 5-Pentanoic acid 25
5-fluoro AB-PINACA N-(4-hydroxypentyl) 10 000
AB-PINACA 4-hydroxypentyl >10 000
ADB-PINACA N-(4-hydroxypentyl) >10 000
UR-144 4-hydroxypentyl 10 000
UR-144 5-hydroxypentyl 5 000
XLR-11 4-hydroxypentyl 2 000
NarcoCheck : Tests de drogue pour les professionnels

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