<P> Auto - agglutination: Falsely ↓ RBC and ↑ MCV </P> <P> Lipaemia: Falsely ↑ haemoglobin . </P> <P> Haemolysis: Will falsely increase the MCHC (measured haemoglobin is proportionally higher than HCT or PCV) and falsely decrease the calculated haemoglobin (fewer intact RBC) </P> <P> Other: Heinz bodies (many, particularly if large) may falsely increase the MCHC but not the MCH . Agglutination: Falsely increases the MCHC (measured haemoglobin is proportionally higher than HCT). The MCH is more accurate in this setting . Excess EDTA: Dehydrates RBC, falsely increasing MCHC and MCH . </P>

Mean cell hemoglobin vs. mean cell hemoglobin concentration