T-cell immunodeficiency UMLS:C1274233 GARD:0005107 SCTID:402792003 T-lymphocyte immunodeficiency T-cell immunodeficiency DOID:613 NCIT:C27145 MEDGEN:226894 MONDO:0003780 T-lymphocyte deficiency (finding) T lymphocyte deficiency A broad classification of disorders that affect the cell-mediated aspect of the immune response. Circulating numbers of T lymphocytes are decreased or ineffective. immunodeficiency disease