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Abstract
A 47-year old man was admitted for macroscopic hematuria and spontaneous hematomas. Laboratory results showed a prolonged partial thromboplastin time (PTT), a prolonged activated partial thromboplastin time (APTT) and a severe vitamin K deficiency. The underlying cause proved to be vitamin K malabsorption due to previously undiagnosed celiac disease, possibly provoked by oral antibiotic administration.