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Table 2 Intraclass correlations of various coagulation tests and intraobserver variability of fibrinogen tests with various platforms

From: Variability between laboratories performing coagulation tests with identical platforms: a nationwide evaluation study

Parameter Platform 1* Platform 2 Platform 3 Platform 4
# laboratories 1 2 4 2
Fibrinogen 0.85 0.37 0.65 0.66
 Within- laboratory  variability ¶   0.02 0.03 0.04
 Between- laboratory  variability +   0.097 0.03 0.006
Prothrombin time   0.19 0.24 0.80
F II   0.44 0.04  
F V   0.63 0.22  
F VII   0.71 0.82  
F VIII   0.93 0.61  
F IX   0.86 0.83  
F X   0.82 0.70  
F XI   0.90 0.65  
F XIII   0.57 0.81  
  1. * laboratory was excluded from analysis of between-laboratory variability because of a unique platform, ‡ analysis was limited to routine coagulation parameters, because one laboratory did not assess all tests, ¶ (Platform + Technician), + Laboratories use the platform in different ways (they interpret the manual differently).