V.2. Laboratory tools
Evidence of IgE responses and eosinophil involvement support a
hypersensitivity mechanism, while mycological evidence of fungal
persistence is more challenging to obtain (4,6,83,85). Particularly in
the case of HSP and ABPA, the determination of mold-specific IgG
(A. fumigatus- specific IgG in the case of ABPA) is an additional
useful diagnostic tool (95).