I agree that there's no specific standard, but I'm referring to the AABB technical manual 15th ed, pg 455 "Many workers routinely attempt to determine the cause of a positive DAT when the patient has recevied transfusions within the previous 3 months". I just don't know how to adjust my protocol because I can't find any documentation to back me up. Is this something I can change based on my patient population or are there any specific guidelines to follow? The AABB manual also goes on to say that "antibody may appear as early as 7 to 10 days (but typically 2 weeks to several months)". That, to me, leaves a lot open to interpretation.