A Rare Red Cell Phenotype in a 36-Year-Old Woman

1. What is this patient’s red blood cell (RBC) antigen phenotype? 2. What is unusual about this patient’s RBC antigen phenotype? 3. What antibody is present in this patient’s serum, and what is its significance? 4. Is this patient an immunologic “non-responder,” since she never made an anti-k antibody despite 5 pregnancies and deliveries? 5. Should this patient receive k-negative blood even though she has not thus far made anti-k?