| Storage condition | 
        Analyte concn. 
          (ng/mL) | 
         Calculated con.(ng/mL) | 
        % CV | 
        Accuracy (%) | 
       
      
        | Plasma | 
        Urine | 
        Plasma | 
        Urine | 
        Plasma | 
        Urine | 
       
      
        | Three freeze-thaw cycles | 
        100.80 | 
        105.96 ± 3.091 | 
        94.66 ± 4.737 | 
        2.9 | 
        5.0 | 
        105.1 | 
        93.9 | 
       
      
        | 8400.00 | 
        7902.81 ± 34.742 | 
        8059.43 ± 180.754 | 
        0.4 | 
        2.2 | 
        94.1 | 
        95.9 | 
       
      
        Autosampler 
           (24 hr) | 
        100.80 | 
        106.28 ± 4.775 | 
        107.68 ± 2.734 | 
        4.5 | 
        2.5 | 
        105.4 | 
        106.8 | 
       
      
        | 8400.00 | 
        7878.79 ± 168.324 | 
        7851.06 ± 285.283 | 
        2.1 | 
        3.6 | 
        93.8 | 
        93.5 | 
       
      
        Bench top  
          (6 hr) | 
        100.80 | 
        104.81 ± 2.272 | 
        100.65 ± 5.470 | 
        2.2 | 
        5.4 | 
        104.0 | 
        99.9 | 
       
      
        | 8400.00 | 
        8037.10 ± 133.286 | 
        8057.51 ± 259.936 | 
        1.7 | 
        3.2 | 
        95.7 | 
        95.9 | 
       
      |