{HEAD ~ The mixing reaction} of the animal plasma, FXII activator and {TAIL ~ tested substance} is preferably carried out at 0° C. to 4° C. so that the intrinsic inhibitor hardly acts and, in addition, the progress of the reaction can be easily controlled 
{ HEAD ~ The mixing reaction } of the animal plasma , FXII activator and { TAIL ~ tested substance } is preferably carried out at 0 ° C. to 4 ° C. so that the intrinsic inhibitor hardly acts and , in addition , the progress of the reaction can be easily controlled
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