Previously warmed ES was given because of the presence of positive cold antibody
Aside from prewarming the specimens, circumventing an offending cold antibody
can be done by using 22% bovine serum albumin instead of low ionic-strength solutions because some cold RBC autoantibodies are enhanced by low ionic-strength solutions.
Successful Treatment of a Patient with Mixed Warm and Cold Antibody
Mediated Evans Syndrome and Glucose Intolerance.
This hints at a possibility of a form of K2EDTA-related, cold antibody
of IgM type in the patient's serum.