Viral Infection: Many viral infections can cause an increase in lymphocyte count, and a reactive increase in platelets can also occur. The absolute lymphocyte count of 4752 is significantly elevated, suggesting a viral etiology.

Chronic Lymphocytic Leukemia (CLL): Although CLL typically presents with an elevated lymphocyte count, the platelet count can also be elevated in some cases. However, CLL usually presents in older adults.
Reactive Lymphocytosis: This can occur in response to various stimuli, including infections, inflammation, or other stressors, and can be accompanied by an increase in platelet count.
Infectious Mononucleosis: Caused by Epstein-Barr virus, this condition can lead to an increase in lymphocyte count and sometimes an increase in platelet count as part of the body's response.

Lymphoma: Both Hodgkin and non-Hodgkin lymphoma can present with an elevated lymphocyte count. While not all lymphomas will have an elevated platelet count, missing this diagnosis could be critical.
Tuberculosis: Although less common, tuberculosis can cause an increase in lymphocyte count and, in some cases, an increase in platelet count as part of the body's inflammatory response.
Acute Lymphoblastic Leukemia (ALL): This is a more aggressive form of leukemia that can present with an elevated lymphocyte count. It's crucial not to miss this diagnosis due to its rapid progression and need for immediate treatment.

Castleman Disease: A rare disorder that involves an overgrowth of cells in the body's lymph nodes, which can lead to an increase in lymphocyte and sometimes platelet counts.
Lymphoproliferative Disorders: These are a group of disorders characterized by the excessive proliferation of lymphocytes, which can lead to elevated lymphocyte counts and, in some cases, elevated platelet counts.
Myeloproliferative Neoplasms: Although primarily associated with elevated platelet counts, some myeloproliferative neoplasms can also cause an increase in lymphocyte count, albeit less commonly.