Just wondering if there is a serious health risk involved here. Yesterday I went to the local blood bank to donate. They only managed to get half a pint before giving up. I wonder if it would be dangerous for me to go donate plasma later this week. I am a 27 year old male, 230 pounds and 6'1". To me, half a pint does not seem like that much. I have never donated plasma before, but I hear they put saline and most of the blood back in you. If I was well hydrated would this be a problem? Thanks.