Direct Antiglobulin Test

Patient : Hello. I recently donated blood at my High School for the United Blood Services. This is my second whole blood donation and this time they returned back to me with a letter explaining an unusual test result. I tested Positive to the Direct Antiglobulin Test (DAT) and I was curious on what this could be. The first time I donated blood, there seemed to be nothing wrong with me or my blood. Now I haven't been on any medications, never had a blood transfusion, and never had the issue with my blood being an issue with my mom's blood at birth. What could this possibly be, and why didn't it test positive in my previous donations?
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