Problem to be solved: to provide a dry reagent capable of quantifying fibrinogen with no dilute solution.Solution: (I) protein having thrombin or thrombin activity, (II) magnetic particle, (III) fibrin monomer Association inhibitor, (IV) calcium salt, (V) drying reagent layer solubility improving agent, (VI) dry reagent layer reinforcement, and (VII) pH buffer for fibrinogen determination for a dilute specimen A drying reagent is provided.Diagram
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