Sweat Patch



What is a sweat patch?

Sweat patch is an absorbent pad that is attached to the skin just like a band-aid. It is often used as an effective method for drug testing, especially in the field of forensic toxicology. The patch is normally worn for up to 14 days, in which sweat deposits will be slowly collected.

The patch is made up of a semi-permeable membrane that allows small molecules, such as oxygen and water vapor to escape. Whereas, large molecules such as drugs will remain trapped under the patch and will be submitted to the laboratory for analysis.

Sweat patches can collect alcohol, amphetamine, cocaine, heroin, morphine, methadone, methamphetamine, phencyclidine and etc.

Why are they important?

Sweat patch can be used in many occasions with high efficiency and accuracy. For example, it is now widely used in federal workplace drug testing programs. Sweat patch can be distributed for pre-employment screening or for employees who are returning to work after an absence or accident. By doing so, a company can ensure employees’ health and healthy working environment


Activity Overview

Students will be given a worksheet and are expected to analyze structures of epidermal layers and understand the processes of sweat secretion.

  • Duration: 20min

  • Materials: worksheet

Class Materials

Below are links to download:

Sweat Patch Info Sheet https://static.wixstatic.com/ugd/6b539f_7cc4dc791d60482bad0ef0f216e88556.pdf

Sweat Patch Activity sheet https://static.wixstatic.com/ugd/6b539f_d7fca53d14734c30835d0de4dd3c5b89.pdf

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2019 STEmming Edu. 

Dawon Chung 

Yoon Seo Kim

Se Yoon Park