What Is Considered A High Lymphocyte Count?

What Is Considered A High Lymphocyte Count? A count significantly higher than 3,000 lymphocytes in a microliter of blood is generally considered to be lymphocytosis in adults. In children, the threshold for lymphocytosis varies with age. It can be as high as 9,000 lymphocytes per microliter. When should I be concerned about high lymphocytes? High