Final answer:
IgG antibodies can be detected via an ELISA test, which offers specificity and the ability to confirm positive results through additional testing.
Step-by-step explanation:
IgG antibodies require enzyme-linked immunosorbent assay (ELISA). The direct ELISA specifically is well-suited for detecting the presence of IgG antibodies because it utilizes antigens immobilized in the well of a microtiter plate and involves only a single antibody in the test. This assay's specificity is tailored to identify the presence of IgG due to its unique binding properties. It is important to have a confirmation test following a positive result to rule out cross-reactivity, which might include an immunoblot or a nucleic acid-based test depending on the context.