A spore count with nothing to compare it against
The most common way a mold test wastes money is being read on its own. A laboratory can tell you that a cubic metre of your living room air held 1,400 spores. On its own that number is unusable, because outdoor air in this county carries a heavy background load every month of the year and a house with the windows open is mostly breathing it. Without a control taken outside the same building in the same hour, there is nothing for the number to mean.
The sample that makes the other samples readable
Every job here starts with a cassette run in the outdoor air at the property, before any indoor sample is taken and before anyone has opened a door repeatedly. That control is not a formality and it is not padding the invoice. It is the denominator.
Two things come out of the comparison. The first is count: indoor air substantially higher than the outdoor air it is drawn from points at an indoor source, while indoor air at or below outdoor levels generally does not. The second, and the more useful, is species mix. Outdoor air in South Florida is dominated by a predictable set of genera. When an indoor sample carries a genus the outdoor control barely registers, that difference is the finding even if the total count looks unremarkable.
This is also why we will not sell air sampling as a standalone product. A cassette can tell you something is growing and it cannot tell you where, because air moves. The moisture survey is what converts a laboratory result into an address, and a test booked without one routinely ends with a positive result, a worried customer and no idea which wall to open.
Two limits, stated because they are usually left out. Sampling is a snapshot of one hour on one day, and a system that has just cycled reads differently from one that has been off. And there is no federal or Florida numerical standard for indoor mold, so no laboratory can issue a pass or a fail. Anyone quoting you a legal limit is quoting their own policy.

What the job covers in Fort Lauderdale
What we cover
Air and surface sampling analysed by an accredited independent laboratory, always against an outdoor control taken the same hour at the same property.
What you get
A laboratory report attached in the laboratory name, read against the control, with what the comparison does and does not establish set out plainly.
Decision point
What sampling can prove and what it cannot. There is no legal threshold for indoor mold in Florida, and this page says so rather than implying one.