Missing that service. my son made an appointment to give blood, managed to get away from work early to do, rushed to get there in time, then they kept him waiting only to be told there were not enough people there to take it and sent him away! He was really annoyed. I try to donate blood with a well-hidden vein which results in a burst vein and failed donation. The nurses here should learn a bit of humbleness as this never happened to me in Hungary. There they always found the most senior nurse to find my vein, and everything went well, here the nurse rather argue. I gave up trying its walk-in for the US as well. They also pay you and you get cookies.