Deciding whether you actually need testing. If you can see the growth and know the moisture source, a lab report telling you it is mold rarely changes what happens next. Testing earns its cost most clearly when there's a smell with no visible source, a health concern driving the decision, or an insurance carrier requiring documentation.
A company offering to test and remediate the same job. If any contractor, us included, offers to test your mold and then remediate whatever they find, that's the exact conflict of interest Florida law was written to prevent. We'll say plainly when a caller asks us to do both: we can't, and a company that says yes to both on the same property is not following the state's rules.
Clearance testing timing. Testing air quality too soon after remediation, while air scrubbers are still running or before dust has settled, can produce a falsely clean or falsely dirty reading. We coordinate the clearance appointment for after our equipment comes down and the space has had time to normalize, usually 24 to 48 hours.
Choosing an assessor with the right license. Florida requires mold assessors to carry a specific mold assessor license, separate from a general home inspector license or a contractor license. Ask to see it before you pay for testing. It's a fair question and any legitimate assessor expects it.
One thing we do not do: test our own remediation work, before or after. We'll recommend an independent assessor and coordinate scheduling, but we will not grade our own results.