Live-threatening bleeding - 2014

52 year old male, accompanied by his wife, attends his general practitioner with the complain of vomiting blood. His clothes are soaked with blood, he is confused and pale. According to his wife, the husband vomited a large amount of bright red blood in the last 2 hours. He has never had a problem like this before. Denies high temperature or shivering. The man neither takes any medication regularly, nor was he treated for any chronic disease. He has a history of chronic alcoholism. What will be the GP´s next step?
52
years
man
Glycaemia
Gly
6,0  mmol/L
Glycaemia
Take a sample