![]() Evidence from military casualties in Afghanistan suggests giving blood before patients reach hospital leads to better survival rates, but evidence from civilian populations in the UK is less clear. Whether or not a severely injured person will receive blood products at the scene of an accident depends on which air ambulance service they are attended by: some air ambulances replace lost blood with red blood cells, but others replace only with saline solution. ![]() Dr Margaret McCartney takes a look at the study that generated the headlines. Vitamin D, the sunshine vitamin, has been in the news again with claims that supplements could help ward off coughs, colds and flu.
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