[Haptoglobin type and isoantibodies (anti-A and anti-B)].

: In 582 sera of blood donors of the groups A1, A2, B and 0 the Hp type as well as the anti-A or anti-B isoantibody titres respectively were determined. The frequency distribution of isoantibody titres in serum samples with different Hp-type were compared. As far as the numerical difference of distribution was concerned there was only one significant observation in the group of B alpha--titres of test persons with a different Hp-type. On the basis of these findings the following Hp-type/isoantibody relation can be established: low anti-A or anti-B titres respectively (approximately 1:8) will occur more frequently in persons with the Hp-type 1-1, higher titres (approximately 1:64) are to be found predominantly in persons with Hp2 genes. These findings are in accordance with other results, on the basis of which is was suggested that persons with Hp2 gene product have a higher immunogenic reactivity in comparison to type Hp 1-1.