Given a scenario where a patient's serum agglutinates with group A antigens but not with group B, what blood type does the patient have?

Prepare for the AAB Medical Technologist (MT) Generalist Exam with flashcards and multiple choice questions. Each question includes hints and explanations to boost your understanding. Get exam-ready now!

The situation described indicates that the patient's serum reacts with group A antigens but does not react with group B antigens. This reaction pattern suggests that the patient has antibodies against type B antigens, which leads to the conclusion that they cannot have blood type B or AB, as those types would have B antigens present.

Since the serum agglutinates with A antigens, this means the patient has A antigens on their red blood cells. Therefore, the patient's blood type must be A, as they would produce anti-B antibodies in response to the presence of B antigens, which explains the lack of agglutination with those antigens. Thus, the accurate determination of this patient's blood type is A.

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