Use

This test quantitatively measures IgG4 subclass antibodies specific to Penicillium chrysogenum (formerly Penicillium notatum), a mold commonly found in the environment. Elevated IgG4 may indicate past exposure or hypersensitivity in patients with suspected mold-related respiratory or immune responses. Interpretation should be conducted by clinicians experienced in mold exposure assessment and IgG subclass immunology.