Semiautomated method for determination of cystine concentration in polymorphonuclear leukocytes.

higher) than the analytical sensitivity, allowing for acceptable clinical specificity. Furthermore, there was excellent clinical concordance between the Vitros ECi and Dade RxL cTnI assays. The cTnI values obtained with the ECi were approximately one-half of the those obtained with the RxL cTnI, probably because of the lack of antigen and antibody standardization between assays (4 ). Thus, the Vitros ECi Troponin I immunodiagnostic assay appears to be an acceptable alternative for monitoring plasma or serum cTnI for ruling in and ruling out AMI. As for risk stratification in acute coronary syndrome patients (6 ), additional clinical evaluation studies will be necessary to validate it applicability in clinical practice.