Cavitary pneumonia and concern for abscess in immunocompromised host 

• Fungitell assay

• Aspergillus serum galactomannan

• Histoplasma/Blastomyces urine antigen

• Cryptococcus urine antigens

• QuantiFERON TB

• Coccidioides serologies

• Karius cell free DNA

May be bronchoscopy too.