WAC 16-309-140. Method performance criteria

(1) Accredited labs may reference samples for testing by subcontracting fields of testing to another accredited laboratory. (2) Laboratories must maintain the integrity of the sample by testing samples on an "as is" or "as received" basis before sample prep unless otherwise specified in rules. (3) Laboratories may use historical calibrations for high complexity testing as long as it is supported by analytical data through quality control results. Historical calibrations cannot extend past 30 days. (4) The samples fail quality control testing if the results exceed the limits indicated in chapter 314-55 WAC. (5) Sample results are positive for the analyte being tested if their results are greater than or equal to the decision point or cutoff limits as indicated in chapter 314-55 WAC. (6) Sample results are to be reported out in the number of digits and units of measure described in chapter 314-55 WAC. (7) Laboratories may be accredited to conduct the following fields of testing: Field of Testing Level of Complexity water activity low cannabinoid concentration analysis high foreign matter inspection low microbiological testing culture method moderate immunoassay method moderate polymerase chain reaction (PCR) method high residual solvent testing high mycotoxin testing enzyme-linked immunosorbent assay (ELISA) method moderate liquid chromatography with tandem mass spectrometry (LC-MS/MS) method high pesticide testing high heavy metals testing high Field of Testing Level of Complexity water activity low cannabinoid concentration analysis high foreign matter inspection low microbiological testing culture method moderate immunoassay method moderate polymerase chain reaction (PCR) method high residual solvent testing high mycotoxin testing enzyme-linked immunosorbent assay (ELISA) method moderate liquid chromatography with tandem mass spectrometry (LC-MS/MS) method high pesticide testing high heavy metals testing high