Does K2 (Spice) Show Up on a Drug Test?
Updated October 16, 2026
K2, Spice and the other synthetic cannabinoids are not one of the 14 panels on a standard rapid drug screen, and they do not set off the THC panel. Four of them are on the laboratory's 81-substance confirmation menu, so they are found only when laboratory confirmation is ordered.
On the laboratory's menu they appear under Synthetic cannabinoids (K2), as JWH-210, JWH-250, UR-144 and XLR-11.
Is K2 on the 14-panel test?
No. The clinical cassette read at every Testr visit screens 14 panels, and none of them is a synthetic cannabinoid panel. The one people expect to catch it, THC, does not: that strip is built around THC-COOH, the metabolite of natural cannabis, and the compounds sprayed onto K2 and Spice products have a different structure that the strip does not recognize. A rapid read reports nothing about K2, positive or negative, and that is true of most rapid urine screens sold or used anywhere.
An earlier Testr cassette carried a K2 strip; the current 14-panel cassette does not, which is why the answer on this page changed.
Will a 5-panel or 10-panel drug test catch K2?
Not as standard. A 5-panel drug test covers amphetamines, cocaine, THC, opiates and PCP, and none of those five is a synthetic cannabinoid. A 10-panel drug test keeps the same five and adds five more that vary by kit, most often benzodiazepines, barbiturates and methadone, then methamphetamine or oxycodone; a synthetic cannabinoid is not among the usual additions either. Testr's 14 panels do not include one. Some cups do carry a separate strip, printed as K2 or SPICE, so the codes printed on the cup are the only way to know what a given cup looks for, and every drug test abbreviation is decoded on one page.
Because K2 does not set off the THC strip, a negative THC line on any of those cups says nothing about synthetic cannabinoids either way. On a Testr order the only step that looks for them is laboratory confirmation, whose menu lists four: JWH-210, JWH-250, UR-144 and XLR-11, each at 2 ng/mL. A product made with a different synthetic compound would not appear on that report.
What the laboratory can confirm
The CAP-accredited laboratory Testr uses confirms an 81-substance menu, and four synthetic cannabinoids are on it, each reported as its own measured level. The limit is the list itself: manufacturers change the compounds in K2 and Spice products constantly, so a laboratory panel covers the compounds it names and no others, and a negative laboratory result does not rule out a newer synthetic that is not on the menu.
None of this happens on the rapid read alone. Choose the Rapid Test with Laboratory Confirmation at booking, or add confirmation to an At-Home Rapid Test from the app within 2 hours of collection, before the specimen stops being viable. The laboratory's report follows in about 72 hours. Every laboratory report goes to a Medical Review Officer (MRO), a physician who reviews laboratory-confirmed results and accounts for valid prescriptions before the report is released. The 2-hour upgrade window post explains how that works.
How Testr tests for it
The visit is the same one every Testr client gets: a certified collector at your home or office anywhere in the Los Angeles area, 7 AM to 7 PM, seven days a week, with the earliest window 3 hours after you book. The collector verifies identity at the door with a PIN, checks specimen temperature, reads the 14-panel cassette on the spot, and seals the specimen under a chain-of-custody code for the trip to the laboratory. Results go to the ordering account and nowhere else, unless the account holder authorizes a release in writing. Testing a teenager? Start with Testr for parents. Ordering for a client? See Testr for professionals.
Book a visit → Or download the app
Questions about K2, Spice and drug tests
Does K2 or Spice show up on a drug test?
Not on a standard 14-panel rapid screen. Synthetic cannabinoids are lab-made compounds that do not produce THC-COOH, the metabolite the THC panel looks for, so a rapid cup does not react to them. The CAP-accredited laboratory Testr uses lists four synthetic cannabinoids on its 81-substance confirmation menu, so they are found only when laboratory confirmation is ordered, and only if the product contained one of those four.
Does K2 make the THC panel positive?
No. The THC strip is built around THC-COOH from natural cannabis, and synthetic cannabinoids have a different structure that the strip does not recognize. A positive THC read means THC-COOH; a negative THC read says nothing about K2 either way.
Which synthetic cannabinoids can the laboratory confirm?
JWH-210, JWH-250, UR-144 and XLR-11, each at a 2 ng/mL cutoff, measured by LC-MS/MS in urine. Products sold as K2 or Spice change formula constantly, so a laboratory panel covers the compounds it names and no others; a negative laboratory result does not rule out a newer synthetic that is not on the menu.
Will a 5-panel or 10-panel drug test detect K2?
Not as standard. A 5-panel covers amphetamines, cocaine, THC, opiates and PCP, and the usual 10-panel additions are benzodiazepines, barbiturates, methadone, methamphetamine and oxycodone, so neither count includes a synthetic cannabinoid. Some cups add a separate strip printed as K2 or SPICE; the codes printed on the cup show whether it is there.
Which Testr test do I need for K2?
The Rapid Test with Laboratory Confirmation. The 14-panel read still happens on site, then the sealed specimen goes to the laboratory for confirmation against its full menu, with results in about 72 hours. Every laboratory report is reviewed by a Medical Review Officer (MRO), a physician who reviews laboratory-confirmed results and accounts for valid prescriptions before the report is released. An At-Home Rapid Test can be upgraded from the app within 2 hours of collection.