
MCH stands for Mean Corpuscular Hemoglobin, and is a calculation of the average amount of hemoglobin contained within each of a person's red blood cells. Hemoglobin is the substance that carries oxygen from the lungs to the cells of the body through the bloodstream. Abnormally high or low levels of MCH, as determined by blood testing, can be an indication of a number of problems within the body, ranging from nutrient deficiencies to chronic diseases.The MCH blood test is done as a component of a blood test called a Complete Blood Count (CBC), which evaluates the composition of the blood, checking hematocrit, white blood cells (WBC) and platelets as well as hemoglobin and red blood cells (RBC). It is usually ordered to get an overview of general health. MCH is not measured directly, but calculated based on the hemoglobin value (Hgb), which is the total measure of hemoglobin in the blood, and the RBC, which is the number of red blood cells in the blood. To calculate MCH, the Hgb is divided by RCB, yielding an average amount of hemoglobin per red blood cell. Normal levels of MCH are between 26 and 33 picograms (pg) of hemoglobin per RBC.