A calculated measurement in which the number of lymphocytes in a specified sample of blood is divided by the total number of white blood cells in the sample, and the result presented as a ratio, fraction, quotient or percentage. The trait is EFO_0007993 (lymphocyte percentage of leukocytes). Also known as: blood lymphocyte count to total leukocyte count ratio, lymphocyte count as percentage of total white blood cells, lymphocyte count to total WBC count ratio, lymphocyte percentage, lymphocyte percentage of white cells.