This article was last reviewed on
This article waslast modified on 26 October 2018.


Mean Cell Volume (MCV), Mean Cell Haemoglobin (MCH), Mean Cell Haemoglobin Concentration (MCHC) and Red Cell Distribution Width (RDW) are measurements relating to the volume, size and haemoglobin content of red cells in the blood.  These are measured or calculated as part of a full blood count (FBC) analysis, which may be carried out as a general screen during routine healthcare examinations or for the diagnosis or monitoring of diseases that affect the blood and bone marrow.

The MCV, MCH, MCHC and RDW provide information on the overall size and volume of the circulating red cell mass and so can help in the diagnosis or monitoring of conditions affecting the red cell size and shape.

To learn more about the FBC and these individual components, please review the FBC page, especially "The Test: How is it used?" and "The Test: What does the test result mean?" (RBC Evaluation) sections.