Posted Date
Effective Date
Update Type New Tests
Order Code EDN
Referral Laboratory Mayo Medical Laboratories



Eosinophil Derived Neurotoxin, Serum

Order Code:                  EDN

Fee Code:                     pending (CPT 83520)

Reference Laboratory:   Mayo EDN


Mayo Clinic Laboratories Eosinophil Derived Neurotoxin, Serum assay will be available effective January 16, 2023.  This test is used for evaluating patients suspected to have a condition associated with eosinophilia or hypereosinophilia, evaluating patients with elevated peripheral blood eosinophil counts, and managing patients with elevated eosinophil-derived neurotoxin in the context of eosinophil-associated diseases.  This test replaces Mayo Clinic Laboratories test ID FECP (order code MMLR) Eosinophil Cationic Protein referred to Quest Diagnostics.


Collection Instructions: Collect specimen in an SST (preferred) or red top tube. Centrifuge, aliquot 0.5 mL (minimum 0.3 mL) of serum into a plastic vial within 12 hours of collection and refrigerate.


Reference Range: <70 mcg/L Normal; 70 – 99 mcg/L Borderline; > or = 100 mcg/L Elevated.