Critically ill patients with spontaneously prolonged pro-thrombin time, where administration of intravenous administration of phytomenadione (vitamin K) has been ordered by the treating physician will be identified. After signed informed consent baseline samples will be collected. Phytomenadione will be given and 24 hours after administration new blood samples will be collected. Several different advanced coagulation and vitamin K-assays will be performed before and 24 hours after vitamin K administration.
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Change in prothrombin complex (PK-INR)
Timeframe: Before and 24 hours after given phytomenadione