Bulk material

• Prefer serial dilution methods

• Report results in CFU/gram of material

• Guidelines based on University of Minnesota Department of Environmental Health & Safety

Surface wipes or swabs

• Generally, a qualitative or semi-quantitative test method (CFU/swab)

• Results can also be reported in CFU/sq inch or CFU/sq cm

Contact plates

Vacuum samples (“micro-vac”)

• For dust in carpet or upholstered furniture

• Must collect ~a gram of material (2 thimbles-full)

• Serial dilution, culture plates                                      More Sampling Methods...