Yes ISM is found in blood a blood component.
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This is because their is no receptor to facilitate IgM on the placenta. IgM is too big is a common, and wrong misconception.
There are five immunoglobulin classes (isotypes) of antibody molecules found in serum: IgG, IgM, IgA, IgE, and IgD. IgA (immunoglobulin A) IgD (immunoglobulin D) IgE (immunoglobulin E) IgG (immunoglobulin G) IgM (immunoglobulin M)
IgM is produced upon initial exposure to an antigen. For example, when a person receives the first tetanus vaccination, antitetanus antibodies of the IgM class are produced 10 to 14 days later. IgM is abundant in the blood.
That you have an acute Rubella infection and have developed IgM antibodies.
CMV IgM is a lab test that detects IgM for cytomegalovirus (CMV), usually in blood. IgM usually indicates a recent or current infection; in the case of CMV, it may also indicate reactivation of an old, latent infection.
IgM
IgM
InGame Messsage
IgM is the antibody first secreted during primary response
Immunoglobulin G (IgG), the most abundant type of antibody, is found in all body fluids and protects against bacterial and viral infections. Immunoglobulin M (IgM), which is found mainly in the blood and lymph fluid, is the first antibody to be made by the body to fight a new infection.