There’s one other way to boost blood supplies. Pay people for it.
Pop-Sci – How To Boost Blood Supplies:”Problem: The shelf life of donated blood is short, just 42 days, and during emergencies even a large supply can quickly run out. To prolong blood’s useful life, hospitals can freeze it, but they rarely do so because technicians need to add glycerol, which prevents ice from ripping the red blood cells apart. The trouble is that glycerol is toxic and must be removed before the blood is used, a process that can take several days—time patients don’t typically have. In order to keep stocks high, hospitals must rely on a constant stream of donors that’s less than reliable.”