blood T lymphocyte count to total lymphocyte count ratio blood CD3 lymphocyte count to total lymphocyte count ratio 2019-07-30T15:18:01Z A calculated measurement in which the number of lymphocytes expressing the CD3 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. The CD3 (cluster of differentiation 3) T cell co-receptor helps to activate both the cytotoxic T cell (CD8+ naive T cells) and also T helper cells (CD4+ naive T cells). It consists of a protein complex and is composed of four distinct chains. CMO:0003221 VT:0006387 clinical_measurement_ontology sjwang