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Hi Mary Anne,
Yes, it's always a good idea to check the radon levels in your home, particularly if you're about to improve the airtightness of the building. Some areas are more prone to it than others, here is a map from Environement Canada to see if you are in a high risk area.
https://radonkit.ca/radon-gas-map-for-canada-potential-radon-levels-across-canada/
Keep in mind that the risks of radon exposure in homes is not limited to the air, it can also be present in water if you get your water from a well. Here are a couple of pages on our site where you can learn a bit more if you like -
My question was- is it best to check for radon AFTER tightening the home, rather than before, if one is going to improve the sealing of air movement for insulating purposes?
I don't know about anyone else, but personally for $60 I'd buy a twin pack and I'd test before and after especially if I lived in a potentially higher risk area. I found this retailer who is discounting the kits http://bit.ly/ecohome-radon-gas-test-kit (and I've no affiliation with this seller).
Studies I've seen suggest that Radon is a bigger problem than we realize - I'd be interested to know where you are and the results?