Lymphocytosis peripheral blood lymphocytes 45 x 109L

• Leukaemias and lymphomas including: CLL, NHL, Hodgkin's disease, acute lymphoblastic leukaemia, hairy cell leukaemia, Waldenstrom's macroglobulinaemia, heavy chain disease, mycosis fungoides, Sezary syndrome, large granular lymphocyte leukaemia, adult T-cell leukaemia lymphoma (ATLL).

• Infections e.g. EBV, CMV, Toxoplasma gondii, rickettsial infection, Bordetella pertussis, mumps, varicella, coxsackievirus, rubella, hepatitis virus, adenovirus.

• 'Stress' e.g. myocardial infarction, sickle crisis.

• Rheumatoid disease (occasionally).

• Vigorous exercise.

• Post-splenectomy.

• b thalassaemia intermedia.

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