the problems of storing blood

• There were still problems of there not being enough blood as it could not be stored in bags due to the blood clotting when it left the body.
• In 1915, Richard Lewisohn discovered that adding sodium citrate to blood stopped it clotting, so it could now be stored in packs for 2 days
• In 1916, Francis Rous and James Turner dis covered that adding citrate glucose solution meant it could be kept for up to 4 weeks.
• These two improvements meant that human-to-human was no longer needed