Anticoagulants used for hematologic studies have certain advantages and disadvantages. The anticoagulant most commonly used in avian hematologic studies and usually the anticoagulant of choice is EDTA (ethylenediamine tetraacetic acid) (Dein 1986, Campbell and Ellis 2007). Others that are also employed are lithium heparin and sodium citrate (Cohen 1967, Fourie 1977, Lumeij 1987, Campbell and Ellis 2007).