Flow cytometry detects antibodies linked to tumour cell surface antigens in fluid samples or cell suspensions.[13] Polymerase chain reaction (PCR) for antigen receptor rearrangements (PARR) identifies circulating tumour cells based on unique genetic sequences.[14] The canine Lymphoma Blood Test (cLBT) measures multiple circulating biomarkers and utilises a complex algorithm to diagnose lymphoma.[15] This test utilises the acute phase proteins (C-Reactive Protein and Haptoglobin).