The Antibody Normally Constituting the Highest Percentage of Antibodies in the Blood

Question

The antibody normally constituting the highest percentage of antibodies in the blood is:
A)IgE.
B)IgG.
C)IgM.
D)IgA.

Accepted Answer

IgG constitutes about 75-80% of the antibodies in the blood, making it the most abundant antibody isotype in circulation. IgM is the largest antibody, but only constitutes about 5-10% of the antibodies in the blood. IgA constitutes about 10-15% of the antibodies in the blood. IgE only constitutes a small fraction of the antibodies in the blood.