Algorithm for the identification and evaluation of a cat with non-regenerative anemia. HCT = hematocrit; PCV = packed cell volume; CBC = complete blood count; FeLV = feline leukemia virus; FIV = feline immunodeficiency virus; PARR = PCR for antigen receptor rearrangements; IFAT = immunofluorescence antibody test. Adapted from Ettinger SJ, Feldman EC and Cote E. Textbook of Veterinary Internal Medicine, Expert Consult, 8th ed, 2017, with permission of Elsevier