title: Evaluation of the red cell hemolysis in packed red cells during processing and storage.
abstract: BACKGROUND
  Storage of red cells causes a progressive increase in hemolysis. In spite of the use of additive solutions for storage and filters for leucoreduction, some amount of hemolysis is still inevitable. The extent of hemolysis, however, should not exceed the permissible threshold for hemolysis even on the 42(nd) day of storage.
  
  
  METHODS
  Eighty units of packed red cells, 40 stored in SAGM post leucoreduction and 40 in ADSOL without leucoreduction filters, were evaluated for plasma hemoglobin by HemoCue Plasma Hemoglobin analyzer on the day of collection and on the 7(th), 14(th), 21(st), 28(th), 35(th) and 42(nd) days thereafter. The hemoglobin and hematocrit were also noted for all these units by the Beckman and Coulter analyzer. Percentage hemolysis was then calculated.
  
  
  METHODS
  Hemolysis progressively increased with the storage period in all the stored red cell units (SAGM as well ADSOL). However, on day 42(nd) of storage, free hemoglobin in all the red cell units was within the permissible level (which is 0.8% according to the Council of Europe guidelines and 1% as per the US FDA guidelines). The mean percentage hemolysis was slightly higher in the SAGM-containing bags with an integral leucoreduction filter as compared to the bags containing ADSOL. However this difference was marginal and not statistically significant.
  
  
  CONCLUSIONS
  Hemolysis of the red cells increases with storage. However, maximum hemolysis does not exceed the permissible limits at any time thereby indicating the effect of optimum processing and storage conditions on red cell hemolysis.
authors.affiliation: Department of Transfusion Medicine, Indraprastha Apollo Hospitals, Sarita Vihar, New Delhi 110 076, India.
authors.forename: R N
authors.initials: RN
authors.lastname: Makroo
authors.forename: Vimarsh
authors.initials: V
authors.lastname: Raina
authors.forename: Aakanksha
authors.initials: A
authors.lastname: Bhatia
authors.forename: Richa
authors.initials: R
authors.lastname: Gupta
authors.forename: Abdul
authors.initials: A
authors.lastname: Majid
authors.forename: Uday Kumar
authors.initials: UK
authors.lastname: Thakur
authors.forename: N L
authors.initials: NL
authors.lastname: Rosamma