T-Lymphocytopenia, Idiopathic CD4-Positive

**Definition:** Reproducible depletion of CD4+ lymphocytes below 300 per cubic millimeter in the absence of HIV infection or other known causes of immunodeficiency. This is a rare, heterogeneous syndrome and does not appear to be caused by a transmissible agent.

**Tree numbers:** - C15.378.243.750.605.800 - C15.378.553.546.605.800 - C20.673.627.800

**Synonyms:** - CD4-Positive T-Lymphocytopenia, Idiopathic - Idiopathic CD4-Positive T-Lymphocytopenia - CD4+ T-Lymphocytopenia, Idiopathic - Idiopathic CD4+ T-Lymphocytopenia - T-Lymphocytopenia, Idiopathic CD4+ - CD4+ T-Lymphocytopenia - Idiopathic CD4 Positive T-Lymphocytopenia