The CA72.4 GI test is performed to measure the value of CA72.4 in the blood. It is also known as GI Cancer Antigen 72-4 Monoclonal Antibody Blood, GI Cancer CA 72-4 Monoclonal Antibody Blood, GI Cancer Marker 72-4 Monoclonal Antibody Blood, GI Cancer Antigen 72-4, GI Cancer CA 72-4 and GI Cancer Marker 72-4. The blood serum is used for the test. It is used for the diagnosis of Gastrointestinal Cancer. The values given in the test should be taken seriously to major the extent of the tumor or cancer in the gastro area. In the case when you don’t have any disease yet suffering from gastro trouble, this test is recommended.