blood T lymphocyte count to total lymphocyte count ratio blood CD25 lymphocyte count to total lymphocyte count ratio 2014-05-14T13:11:59Z A calculated measurement in which the number of lymphocytes expressing the CD25 antigen on their surface in a specified sample of blood is divided by the total number of lymphocytes in the sample, and the result presented as a ratio, fraction, quotient or percentage. CD25 is the alpha chain of the IL-2 receptor and is used as a marker of activated T cells, although it can also be found on other leukocytes including some monocytes, B cells, thymocytes and myeloid precursor cells. CD25 is expressed on a subset of resting T cells but at a much lower level than found on activated cells. CMO:0002357 JSmith VT:0006387 blood CD25 lymphocyte count as percentage of total lymphocytes blood CD25(+) lymphocyte count to total lymphocyte count ratio blood activated T cell count to total lymphocyte count ratio blood activated T cell percentage clinical_measurement_ontology calculated blood CD25 cell count