Yep. We bought a test kit off of Amazon that gave us readings of 400+ Bqm on average which prompted me to buy a proper lab testable module. Months later my results came back and the area that was tested showed a bit over 330 +/- 60 Bqm, way past the upper limit of acceptable Radon levels.
I’ve got a guy coming in to install a fan, so we’ll see how that goes.