Historical studies on the Asiago Plateau have pointed to the peculiarity of its inhabitants in terms of their socio-cultural development marked by long periods of linguistic and cultural isolation. The present research on some serum protein markers (TF, GC and HP) aims to establish whether this isolation may have caused this population to become different from the others in terms of gene frequencies. For this purpose, transferrin (TF), group-specific component (GC) and human haptoglobin (HP) polymorphisms were studied in 435 subjects. GC and HP were found to be within the range of variation known for the Italian Peninsula.