The DIY mold air test from My Mold Detective, lets homeowners take professional high quality air-o-cell type mold tests for far less than a mold assessor or mold inspector.
The company tries to get the purchaser to use their expensive labratory, but you can use an inexpensive local laboratory or a good one like IMS Laboratory and have the sample read for about $25 each.

Hope this helps!
Charlles