A US blood bank is offering beer in exchange for blood to try to encourage more people to donate.Cascade Regional Blood Services in Tacoma, Washington state, is offering donors a free pint of beer every time they give blood, reports Metro.Donors, who have to be over 21, are given a coupon entitling them to the free pint when they donate blood through the ‘Give blood, get bear’ scheme.The blood center says that the scheme has worked so well that it is being expanded.The coupon can be redeemed at a number of local pubs and restaurants – although, in the interests of health, they have to wait at least four hours after the donation has taken place before they can give the person their beer.Source: The Mail