Confirm the presence of precipitating antibodies to Aspergillus fumigatus
Gold serum separator (SST) tube
Spin and separate
Ambient (preferred) - 14 days
Refrigerated - 14 days
Frozen - 3 months
Double diffusion (Ouchterlony)
A positive test does not establish the diagnosis of hypersensitivity pneumonitis, nor does the absence of precipitins eliminate the diagnosis.