SECRETOR BLOOD TEST
A person can be either a secretor or a non-secretor. This is completely independent of whether your blood type is A, B, AB or O. In a simplified sense, a secretor is defined as a person who secretes their blood type antigens into body fluids and secretions like the saliva in your mouth, the mucus in your digestive tract and respiratory cavities, etc. A non-secretor on the other hand puts little to none of their blood type into these same fluids. Many metabolic traits, such as carbohydrate intolerance, and immune susceptibilities are linked genetically to secretor subtype.
With respect to the ABO blood types, it is very difficult to state that one type is more advantageous than another. Each blood type has its own strengths and characteristic weaknesses. However, this does not appear to be the case with the Secretor gene. As a generality, being a Non-secretor (based on all of the available information) does actually appear to be a potential health disadvantage. At a very basic level, being able to secrete blood type into your saliva, mucus, etc. allows for an added degree of protection against the environment, particularly with respect to microorganisms and lectins.
An additional advantage of being a Secretor might be a generalized tendency to promote a stabilized, blood-type friendly intestinal bacterial ecosystem. Many of the friendly (probiotic) bacteria in your digestive system actually use your blood type as one of their preferential foods. Since Secretors have a steady supply of blood type in the mucus that lines the digestive tract, their bacteria have a much more constant food supply.
For more product details and a detailed description about the Secretor blood system, click: Secretor<