The decision limit (CCa) is the limit at and above which the sample is considered as non-compliant (with an error probability of a). Detection capability (CCb) is the lowest concentration at which a method is able to detect truly contaminated samples with a sta-tistical certainty of 1Àb. In this study, the values of CCa and CCb for MG in rainbow trout muscle were 0.16 mg/kg and 0.39 mg/kg,respectively, which are below the MRPL of 2 mg/kg.