We had ours tested and it is high. So now we'll do another short term kit (48 hours) and see what that says. If high we need to fix it. If low then we'll need to do another short term to get an average.
I recommend this for all. Got the kit from County Health and Human Services for $6. Mail it in and get results in about 3 weeks.
Buy Radon Testing Kits Online - DrHomeAir.com
posey
the above site is where our kit was sent. That's why I posted it. I have no monetary interest in it other than am now going to get their mold kit also. After doing the Radon one, they sent coupon for Mold Kit with our Radon rresults.