CDC does not recommend testing. That is not a typo.

Whatever species a sample identifies, the response is the same: stop the moisture, remove what cannot be cleaned, dry the structure. There is no species whose presence means leave it, and none whose absence means the visible growth is acceptable. So the money buys information that does not alter what happens next.

There is also no federal standard for an acceptable level of mold in indoor air, which means a number on a report has nothing official to be measured against.

Three: where nothing is visible but there is a persistent smell and the source cannot be found; where the work is finished and you want independent confirmation; and where a dispute is live and someone needs a record made by a third party. Outside those, the money is better spent on finding the water.

A test for a dispute should be done by someone with no interest in the remediation, for the same reason you would not ask a builder to survey his own work.

A company that both tests and removes has an obvious incentive in what the test finds. Several states have legislated against exactly that: in New York, Florida and Texas, assessment and remediation must be in separate hands, and a firm offering both on one property is describing something it may not lawfully do there.

Even where it is permitted, the incentive does not disappear. Ask who reads the sample and who benefits from the result.

Talk to a doctor rather than to a contractor. Symptoms, sensitivities and existing conditions are medical questions, and no remediation firm — and no website, this one included — is in a position to answer them. CDC publishes plain-language material worth reading first.

A doctor may recommend testing for reasons of their own. That is a different decision from testing to decide whether to remove growth you can already see.