Haptoglobin Polymorphism—another system to differentiate blood groups

ABSTRACT

Haptoglobin phenotypes in blood stains may be identified by vertical electrophoresis in Polyacrylamide gel in a continuous concentration gradient of 5% to 25%.

Blood stains up to five weeks old were successfully grouped yielding reproducible results. There are three main phenotypes. Two relatively rare phenotypic variants which occur chiefly in negroid populations have also been described.