The antibody screen is negative, but a 2 reaction is noted on one of the crossmatch tubes at the AHG phase. What additional test must be performed, and state the appropriate course of action for positive and negative results

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the correct answer is anaphylaxis.

anaphylaxis is a condition caused by insect bites, foods, medications, manifested by tongue swelling, shortness of breath, vomiting, low blood pressure. it sometimes may occur without an obvious reason. it is treated with epinephrine injection.other tretments include antihistamines and steroids,