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Test Code EDN Eosinophil Derived Neurotoxin, Serum


Specimen Required


Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions: Centrifuge and aliquot serum into a plastic vial within 12 hours of collection. Serum cannot sit on either gel or cells for longer than 12 hours.


Useful For

Evaluating patients suspected to have a condition associated with eosinophilia or hypereosinophilia

 

Evaluating patients with elevated peripheral blood eosinophil counts

 

Managing patients with elevated eosinophil-derived neurotoxin in the context of eosinophil-associated diseases

Method Name

Fluorescence Enzyme Immunoassay (FEIA)

Reporting Name

Eosinophil Derived Neurotoxin, S

Specimen Type

Serum

Specimen Minimum Volume

0.3 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 7 days
  Frozen  21 days

Reference Values

<70 mcg/L: Normal

70-99 mcg/L: Borderline

≥100 mcg/L: Elevated

Reference values apply to all ages.

Interpretation

Eosinophil-derived neurotoxin (EDN) concentrations greater than or equal to 100 mcg/L, in the presence of elevated numbers of peripheral blood or tissue-resident eosinophils, may be suggestive of inflammation or increased disease activity in patients with eosinophil-associated diseases.

 

In the context of normal eosinophil counts, EDN concentrations greater than 70 mcg/L may indicate cellular activation and degranulation.

 

In the context of elevated eosinophil counts, EDN concentrations less than or equal to 70 mcg/L may indicate limited or absent cellular activation.

Clinical Reference

1. Wechsler ME, Munitz A, Ackerman SJ, et al: Eosinophils in health and disease: A state-of-the-art review. Mayo Clin Proc. 2021 Oct;96(10):2694-2707

2. Rutten B, Young S, Rhedin M, et al: Eosinophil-derived neurotoxin: A biologically and analytically attractive asthma biomarker. PLoS ONE. 2021 Feb 10;16(2):e0246627

3. Rydell N, Nagao M, Ekoff H, et al: Development of an automated ImmunoCAP research assay for eosinophil derived neurotoxin and its use in asthma diagnosis in children. Pract Lab Med. 2019 Sep 19;17:300138

Day(s) Performed

Tuesday

Report Available

2 to 8 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

83520

LOINC Code Information

Test ID Test Order Name Order LOINC Value
EDN Eosinophil Derived Neurotoxin, S 100976-0

 

Result ID Test Result Name Result LOINC Value
EDN Eosinophil Derived Neurotoxin, S 100976-0