In a case with anti-A = 0, anti-B = 0, and anti-A,B = 0, how should you report the blood type?

In this scenario, the testing results show that there are no detectable antibodies against A, B, or A,B antigen groups. A blood type determination involves looking for the presence of both antigens on the red blood cells and the presence of corresponding antibodies in the serum.

With anti-A, anti-B, and anti-A,B all showing 0, it suggests that there is no reaction indicating the presence of A or B antigens or that there could be an unusual serological result possibly indicating an individual with a rare blood group or a weak expression of the antigens. Additionally, the absence of these antibodies could imply that the individual might have a very unique blood type or a lack of significant antigen expression on their red cells.

Given these factors, the safest conclusion is to report the blood type as undetermined. This reflects the atypical nature of the results observed, and further testing might be needed to ascertain the exact blood group, taking into account possible testing anomalies or rare phenotypes.