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Table 3 Preanalytical mistakes in laboratory testing.

From: Types and frequency of preanalytical mistakes in the first Thai ISO 9002:1994 certified clinical laboratory, a 6 – month monitoring

  Number Number of Number of   
Division of samples* requested preanalytical Frequency (%) (95% Cl)
   tests mistakes   
In-Patient 298,769 304,906 426 0.143 0.129–0.156
Out-Patient 441,268 457,013 622 0.141 0.130–0.152
Total 935,896 941,902 1,048 0.112 0.105–0.119
  1. * The number of requested tests were greater than the number of samples because more than one test could be performed on a sample.