 platelet sequestr man method current method label platelet chromium ethylenediamin tetraacet edta anticoagul rapid hepat sequestr transfus platelet 50 return circul partial destroi spleen on-third surviv evid present indic edta injuri platelet acid-citrat medium buffer plasma ph 6 5 anticoagul 36 85 label platelet surviv averag 62 mark temporari sequestr occur studi thrombocytopen person circul platelet cr activ measur true surviv transfus platelet surviv sequestr platelet studi normal subject surviv data support concept platelet die chiefli process senesc extern scintil scan organ suggest major platelet destroi liver 