MOLD SAMPLING METHODS

Testing for indoor mold growth involves several different practices. Visual observation is an important step in a mold investigation. Obvious mold growth can often be seen in areas of past or present moisture problems. Samples may also need to be taken to test for mold on surfaces or in the air in a building.

This sampling may include: 1) tape-lift samples may be taken from a surface suspected to contain mold, 2) swabs or wipes may be taken from a suspected contaminated site, 3) bulk material may be taken from a suspected contaminated source, or 4) air samples may be taken from an area suspected to have a mold problem. In order to provide a thorough investigation, a combination of these methods should be employed.

CULTURING VS. NONCULTURING?

Culturable and nonculturable sampling methods each have distinct advantages. Often a combination of sampling and culturing methods yields the best information possible.

1. Nonculturable samples allow for quick evaluation of mold spores in the laboratory. A disadvantage is that the spores can be more difficult to identify, even to the genus level.


2. Culturable samples take 7-10 days in the laboratory to grow and analyze. The major advantage is that molds can be more clearly identified to genus, even species level. Not all spores culture well, this can distort laboratory results.

Information about sampling methods is available below:

1. SURFACE TAPE LIFT: Nonviable


2. SURFACE SWAB: Viable and Nonviable


3. BULK SAMPLES: Viable and Nonviable


4. DUST SAMPLES: Viable and Nonviable


5. AIR SAMPLES: Nonviable


6. AIR SAMPLES: Viable