While THCa itself is not commonly tested for in a standard blood test, it’s important to keep in mind that THCa can undergo decarboxylation, a process where heat or light exposure transforms THCa into THC. And THC is a compound that is frequently tested for in drug screenings. It’s wise to be aware that a test that looks for THC may also have the ability to detect the presence of other related compounds, including THCa. If you’re worried about drug testing it may be best to abstain from using THCa flower. As with any cannabis product, educate yourself and make informed decisions before use so that you can enjoy your experience with THCa without concerns.