sputum or stool for the presence of Eosinophils
A mixture of Methylene Blue and Eosin Y stains eosinophil granules red-orange
Remaining cells and background material stains blue
More sensitive than Wright stain
Phase contrast microscopy with Hansel stain can identify mast cells in allergic nasal smears
Eosinophils in urine are usually associated with drug induced Acute Interstitial Nephritis (AIN)
