PFAS TESTING SERVICES Mod 537 with Isotope Dilution - LIQUIDS $375.00 Add To Cart Mod 537 with Isotope Dilution - SOLIDS $425.00 Add To Cart EPA Method 537.1 $450.00 Add To Cart Expedited Testing (5 day turnaround) $200.00 Add To Cart Field Blank - Compliance Testing $150.00 Add To Cart