When I have done blood smears for IHc I fix them in formalin, the water in 
the formalin removes all the red cells and the endogenous peroxide and fixes 
white or abnormal cells to the slide, then I air dry and run as usual. I have 
had great results.
Formalin for 15 min
air dry 15 min
proceed with IHC
                                                   Dana Dittus
                                                     Histology Supervisor
                                                        Abington Memorial 
Hospital