A SUBGROUP BLOOD TEST
Considerable numbers of variants of the A antigen are known, most of which are rare; the B antigen is less variable but several rare variants are known. The most important distinction is between A, the commonest antigen, and A2 which has a frequency of several per cent in most European, African, and West Asiatic populations.
As group A2 is intermediate in several of its properties between A1 and O, it would be of great interest to know whether this applies to its associations with disease, but unfortunately very few investigators of associations have determined the sub-groups of A in their patients.
For more product details and a detailed description about the A Subgroup typology, click: A Subgroup.<