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In children, until the immune system matures (which happens at age 7 or 8), the lymphocyte range is slightly high . A lymphocyte count that is lower or higher than this range should be evaluated to find out the underlying cause and seek necessary treatment. It's possible to have a higher than usual lymphocyte count but have few, if any, symptoms. The higher count usually comes after an illness. It is most often harmless and doesn't last long. But the higher count might be the result of something more serious, such as a blood cancer or a chronic infection. And, when should you see a doctor if routine bloodwork reveals you have extremely high or low levels of lymphocytes ? Read on for the answers to these and other questions. High lymphocyte count, or lymphocytosis, is defined in adults by an ALC exceeding 4,000 lymphocytes per microliter (cells/µL) of blood. In general, the following ranges are considered typical: Reference ranges can vary depending on age, race, and laboratory standards.