Heinz bodies
G6PD deficiency
Psammoma bodies
Papillary adenocarcinoma of the thyroid
Apple-green birefringence on congo red stain
Amyloid
Prussian blue stain
Iron
Ziehl Nelson / AFB
TB
Negatively birefringent aspirate
Gout
Cold agglutins
Mycoplasma pneumonia
Gram negative diplococci
Neiserria Meningitis
Acute and convalescent serology with a four-fold rising titre
Influenza
Sputum positive for cysts on toluidine blue stain
Pneumocystic pneumonia (PJP)
Positive PCR from nasopharyngeal aspirate
Pertussis
Urinary antigen positive
Pneumococcal