Yes. Antibodies, also called immunoglobulins, are proteins made by the immune system that help fight infection, and they circulate in the blood. A routine blood test can measure the three main types: IgG, IgM, and IgA.
IgG is the most plentiful. Typical normal adult levels listed by MedlinePlus are IgG 700 to 1,600 mg/dL, IgA 103 to 501 mg/dL, and IgM 40 to 230 mg/dL, though ranges vary slightly between labs. Levels that are too high or too low can point to chronic infection, inflammation, immune deficiency, or certain blood cancers, so results are interpreted by a health care provider.
Source: MedlinePlus (U.S. National Library of Medicine): Quantitative immunoglobulins blood test
Image: Antibody diagram by Fvasconcellos, public domain, via Wikimedia Commons.