Added concentration Repeated reproducibility Intra-laboratory
(ng/mL)   1st 2nd 3rd reproducibility
2 determined 2.18 2.01 2.60  
  amount     1.85 2.44 1.93 1.89
      2.24 2.16 1.71 2.11  
      1.62 2.00 2.11q 2.11  
      1.58 1.95 2.19    
  average     1.9 2.1 2.1 2.0
  accuracy (%)   -5.3 +5.6 +5.4 +1.8  
  precision (%)   16.2 9.4 15.7 6.2  
40 determined 40.79 37.98 41.24      
  amount     41.45 40.25 39.08 39.24
      39.15 38.56 40.95 39.08  
      37.67 38.64 39.88 41.55  
      37.13 39.99 46.60    
  average     39.2 39.1 41.6 40.0
  accuracy (%)   -1.9 -2.3 +3.9 -0.1  
  precision (%)   4.8 2.5 7.1 3.5  
80 determined 77.90 79.00 76.93      
  amount     76.37 80.80 79.70 76.88
      76.57 80.43 79.27 78.81  
      77.15 77.10 78.32 80.03  
      76.43 76.73 85.92    
  average     76.9 78.8 80.0 78.6
  accuracy (%)   -3.9 -1.5 +0.04 -1.8  
  precision (%) 0.8 2.4 4.3      
Table 3: Reproducibility of ameziniummetilsulfate (AM) determination.