When I had my house tested for mold it cost me $500.00 but was well worth it because they found the mold and I was able to get the mold removed which prevented me and my family from getting sick.
Mold can actually be deadly especially black mold in your home.
It cost me another $500.00 to get the mold removed by professionals and have the moldy drywall and moldy boards replaced in the areas needed.
It can be as high as $6,000.00 as well if there is a lot of mold that needs removed and how much drywall and other things need replaced in your home.