Alloimmunization in dogs after transfusion: A serial cross-match study.

Area of Science:

• Veterinary Medicine
• Immunology
• Transfusion Medicine

Background:

• Cross-matching is vital for determining blood compatibility between donors and recipients.
• Current veterinary guidelines suggest cross-matching for dogs if a prior transfusion occurred over four days ago or if transfusion history is unknown.

Purpose of the Study:

• To determine the timeframe for alloantibody detection in dogs following a blood transfusion.
• To test the hypothesis that dogs develop alloantibodies within four days post-transfusion.

Main Methods:

• A prospective observational study involving 21 anemic dogs receiving transfusions.
• Cross-matching was performed before the initial transfusion and monitored daily for up to 28 days using the tube method.
• Dogs were monitored for transfusion reactions, with exclusion criteria including persistent red blood cell agglutination and prior transfusions.

Main Results:

• Within four days, 12 out of 21 dogs showed positive cross-matches (microscopic agglutination 1+ to 2+).
• No significant association was found between anemia type, red blood cell storage time, immunosuppressive treatment, or transfusion volume and the timing of positive cross-matches.
• An additional four dogs developed positive cross-matches between six and 13 days post-transfusion.

Conclusions:

• Alloantibody production can be detected as early as one day after a transfusion in dogs.
• The findings support the recommendation that cross-matching should be performed prior to every subsequent transfusion in dogs to ensure serological compatibility.