The presence of high titers of antigen-precipitating IgG in the serum.
Comment:
Sensitization to inhaled antigens may cause high titers of antigen-precipitating IgGs. Precipitins support the diagnosis of hypersensitivity pneumonitis, also known as extrinsic allergic, in symptomatic individuals. They may also be found in asymptomatic individuals, indicating exposure to a certain antigen. Major antigens causing hypersensitivity pneumonitis are mushrooms, fungi, yeasts, bird proteins, certains chemicals, bacteria or mycobacteria.
Synonyms:
exact_synonym:
Increased level of antigen-precipitating IgG antibodies