FDA Reminder on Proper Transport Media

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FDA is reminding laboratory staff to use transport media that are compatible with Covid-19 testing platforms and the processes used in their laboratory to process samples collected. “There is a risk of exposure to harmful cyanide gas, a by-product of a reaction between guanidine thiocyanate or similar chemicals and bleach (sodium hypochlorite), when certain transport media are used with an incompatible testing platform or laboratory process,” the reminder says. Guanidine thiocyanate is also referred to as guanidinium rhodanide, guanidinium thiocyanate, or guanidinium.

 

FDA says there are numerous transport media that contain guanidine thiocyanate or similar chemicals. “PrimeStore molecular transport media (MTM) (LH-1-02 and LH-1-03), Zymo DNA/RNA Shield, Spectrum Solutions Saliva Collection Device, and any other transport medium containing guanidine thiocyanate or similar chemicals, should not be used in a testing platform such as the Hologic Panther and Panther Fusion Systems that use bleach or in laboratories that use bleach as part of their normal laboratory processes,” it says. “When the bleach interacts with the guanidine thiocyanate or similar chemicals in the transport media, it produces cyanide gas.”

 

FDA acknowledges that there have been reports of potentially hazardous interactions, but no injuries have yet been reported on exposure to cyanide gas as a result of using incompatible media with testing platforms.

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