PharmChek® is a collection device designed to retain evidence of drug use over the course of wear-time. Detection Periods in sweat differ from those in urine.

Results cannot be used to:

  • Determine the dose of drugs taken
  • Determine the exact time of usage
  • Determine if multiple small doses or one large dose of drug was ingested

Testing Methods & Cutoff levels

Drug or Drug Class Analyte


Opiates: EIA 10ng/mL

Fentanyl: 1 ng/mL

Norfentanyl: 1 ng/mL

6-MAM: 10 ng/mL

Morphine: 10 ng/mL

Codeine: 10 ng/mL

Hydrocodone: 10 ng/mL

Hydromorphone: 10 ng/mL

Oxycodone: 10 ng/mL

Oxymorphone: 10 ng/mL

Cocaine: EIA 10 ng/mL
Benzoylecgonine: 10 ng/mL


Amphetamines: EIA 
10 ng/mL

Amphetamine: 10 ng/mL
Methamphetamine: 10 ng/mL


Marijuana: EIA 1.5 ng/mL
THC: 0.5 ng/mL


Phencyclidine: EIA 7.5 ng/mL
Phencyclidine: 7.5 ng/mL

Download the PharmChek® Sweat Patch Training Manual Download the PharmChek® Sweat Patch Technical FAQ