MCH is the initialism for Mean Corpuscular Hemoglobin. Taken from Latin, the term refers to the average amount of hemoglobin found in red blood cells. A CBC (complete blood count) blood test can be used to monitor MCH levels in blood. Lab Tests Online explains that the MCH aspect of a CBC test âis a measurement of the average amount of oxygen-carrying hemoglobin inside a red blood cell. MCH is one of three red blood cell indices (MCHC and MCV are the other two).
Type II Hypersensitivity. Type II hypersensitivity is also known as cytotoxic hypersensitivity and may affect a variety of organs and tissues. The antigens are normally endogenous, although exogenous chemicals which can attach to cell membranes can also lead to type II hypersensitivity.
Presentation [edit]. Type III hypersensitivity occurs when there is an excess of antigen, leading to small immune complexes being formed that do not fix complement and are not cleared from the circulation. It involves soluble antigens that are not bound to cell surfaces (as opposed to those in type II hypersensitivity).When these antigens bind antibodies, immune complexes of different sizes form. Large complexes can be cleared by macrophages but macrophages have difficulty in the disposal of small immune complexes.These immune complexes insert themselves into small blood vessels, joints, and glomeruli, causing symptoms.hen these antigens bind antibodies, immune complexes of different sizes form. Large complexes can be cleared by macrophages but macrophages have difficulty in the disposal of small immune complexes. These immune complexes insert themselves into small blood vessels, joints, and glomeruli, causing symptoms.