Classification can be related to time-of-onset or to<unk>  severity. Time-of-onset classification divides GvHD into acute or chronic, based on the key time point of 100 days. Severity classification divides GvHD into stages and grades, as defined by the International Bone Marrow Transplant Registry (IBMTR). The ultimate grade of GvHD is determined by the stages of the individual organs affected. Grade 1 GvHD, for example, is characterized by skin involvement but without liver or GI involvement.
Graft-versus-host disease classification
Tuberculosis classification
Mast cell tumor classification
Neutropenia classification
Hemosiderosis classification
Graft-versus-host disease laboratory findings
Cellulitis classification
GRADE system classification scheme