Mold testing involves laboratory analysis of environmental samples to identify mold species, quantify spore concentrations, and assess indoor air quality impacts. Results determine contamination severity and guide remediation decisions.
Testing Methods
Three primary sampling methods provide different data: air sampling captures airborne spores; surface sampling detects settled mold on materials; bulk sampling analyzes actual contaminated material. Samples are cultured on selective media at 25-30 degrees Celsius for 7-10 days, allowing colony counts and species identification through microscopy or DNA analysis. Spore counts are expressed as colony-forming units per cubic meter (CFU/m³) for air samples or per square centimeter (CFU/cm²) for surface samples.
Interpretation and Standards
Baseline outdoor air typically contains 500-2,000 CFU/m³; indoor levels exceeding outdoor levels by 30 percent or more indicate indoor growth. The American Industrial Hygiene Conference recommends counts below 1,000 CFU/m³ for occupied spaces. Testing protocols follow AIHA and ASTM standards to ensure reproducible, legally defensible results for liability and insurance claims.