A retrospective study of blood-ordering practices and blood use for elective surgical procedures at the Veterans Administration Medical Center of New Orleans shows a cross match-to-transfusion ratio of 4.29. To reduce this ratio, a guideline for ABO-Rh type and antibody screen (type and screen) is implemented. This avoids routine cross matching for those surgical procedures where blood is seldom transfused.
(JAMA 243:1536-1538, 1980)
Sarma DP. Use of Blood in Elective Surgery. JAMA. 1980;243(15):1536-1538. doi:10.1001/jama.1980.03300410024017