PharmChek Drugs of Abuse Sweat Patch uses an absorbent pad to capture insensible perspiration, collecting 2mL of sweat weekly from the 300–700 mL excreted daily. The semi-permeable polyurethane film allows small molecules like oxygen, carbon dioxide, and water vapor to pass through, keeping the skin healthy. When drugs are used, metabolites and trace amounts of the parent drug can be excreted through sweat, which the patch collects from application to removal.

The lab analyzes the sweat sample using immunoassay testing, which requires both the parent drug and metabolite for substances like cocaine and methamphetamines—offering a more thorough test than typical drug tests. A positive result is confirmed through LC-MS/MS testing and securely reported via an encrypted web portal.

With strict protocols and secure documentation, the chain of custody remains intact throughout the process. The PharmChek Drugs of Abuse Sweat Patch provides minimal intrusion while offering a reliable solution for drug testing needs.