buffer reagents, diluent reagents, and stopping reagents for medical use, and specifically excluding veterinarian service providers; whole blood lyophilizing kits comprising individual containers of immunolyse reagent, of fixative reagent, of stabilizer reagent and of buffered saline solution for cell suspension preparation of whole blood and bone marrow aspirate studies for medical use, and specifically excluding veterinarian service providers; kits for calibrating and control of in vitro diagnostic electronic hematology analysis instruments comprising control reagents for medical use and vials of reference calibrator; kits for determining white blood cell differentiation in vitro diagnostic electronic hematology analysis instruments comprising individual containers of diluent reagents, lytic reagents, enzymatic reagents, quench reagents and /or control reagents for medical use, and specifically excluding veterinarian service providers