A blood type determination with the ELDONCARD is possible from the age of approximately 12 months and you will retain the same blood type for the rest of your life. By mixing your blood with specific monoclonal antibodies on the ELDONCARD you can determine your blood type. If blood of one type is mixed with blood of another type, it will form clumps or clusters - the so-called agglutinates - except blood of type 0 RhD neg, which does not agglutinate with any other blood type. The RhD group of the complex rhesus system classifies blood as either positive (RhD pos) or negative (RhD neg). The ABO System classifies blood into four possible blood types, A, B, AB and 0. The ELDON HOME KIT 2511 is a self-test kit to determine your blood type inside the AB0- and RhD blood group systems on an ELDONCARD 2511 with one test per card. For Self-Testing of ABO and RhD Blood Groups.