In 1915 Richard Lewinsohn at New York's Mount Sinai Hospital used an anticoagulant, sodium citrate, to prevent donated blood from clotting.
Mme mo masimologong a lekgolo la bo20 la dingwaga, Dr. Richard Lewisohn wa Mount Sinai Hospital, kwa New York City, o ne a atlega go lekeletsa selo se se dirang gore madi a se ke a gwama se se bidiwang sodium citrate.