Apparently, he has one more symptom, his body's making an extra antibody, type B. Combine that with his natural type A, and presto change-o, he magically pulls blood type AB out of his hat.
Because your body only makes those antibodies when you actually have that type of blood.
That's because we don't test blood for type. We test for antibodies.
That's because we don't test blood for type. We test for antibodies. [SEP] Because your body only makes those antibodies when you actually have that type of blood. [SEP] Apparently, he has one more symptom, his body's making an extra antibody, type B. Combine that with his natural type A, and presto change-o, he magically pulls blood type AB out of his hat.