The PharmChek® Sweat Patch is exclusively screened by EIA and confirmed by LC-MS/MS.

All PharmChek® Sweat Patches must be sent to Clinical Reference Lab (CRL) for analysis. No other lab is approved or certified to test the PharmChek® Sweat Patch.

What the PharmChek® Sweat Patch Detects

Drugs Detected Standard Panel Expanded Panel
Cocaine and BE ✔️ ✔️
Opiates (6-AM; Morphine, Codeine) ✔️ ✔️
Methamphetamine ✔️ ✔️
Amphetamine ✔️ ✔️
Marijuana ✔️ ✔️
Phencyclidine ✔️ ✔️
Hydromorphone ✔️ ✔️
Hydrocodone ✔️ ✔️
Fentanyl ✔️
(with Fentanyl Add-On)
Norfentanyl ✔️
(with Fentanyl Add-On)
Oxymorphone ✔️
Oxycodone ✔️
Benzodiazepines ✔️
Methadone ✔️
Buprenorphine ✔️
Norbuprenorphine ✔️

PharmChek® functions as a storage device where drugs are retained on the absorbent pad for detection at the laboratory.

Sweat analysis allows the laboratory to identify both the parent drug and metabolite. With urine, the laboratory usually identifies only drug metabolites to determine if drug use occurred.