Indicator Explainer
Interleukin-5
Interleukin-5 (134 aa, ~15 kDa) is encoded by the human IL5 gene. This protein plays a role in the growth and differentiation of both B-cells and eosinophils.
This page explains what the indicator is and how results are interpreted in general terms. Reference ranges depend on the laboratory, the method, and your own situation — no single “normal value” applies to everyone. This page is health information, not a diagnosis. For symptoms, treatment, or urgent concerns, contact a healthcare professional.
When it is tested
Source: National Cancer Institute, NCI Thesaurus 26.09d, C20509. NCI definition, reproduced without modification under CC BY 4.0. Source identity and definition checked automatically on 2026-10-20. No individual clinical interpretation or human reviewer is asserted.
Reading results
Reference intervals and interpretation depend on the laboratory, specimen, method and clinical context. This source definition is educational information; it does not establish a diagnosis, product approval or suitability for an individual.
Also Known As
References
- NCI Thesaurus 26.09d — Interleukin-5 (C20509)
- Source: National Cancer Institute, NCI Thesaurus 26.09d, C20509. NCI definition, reproduced without modification under CC BY 4.0.
- Clinical experience with anti-interleukin-5 monoclonal antibodies in the treatment of eosinophilic granulomatosis with polyangiitis. — Farm Hosp, 2026-10-14 (PMID 42875351; literature)
- Interleukin 5 Inhibitors and Steroid-Sparing Effects in Drug Reaction With Eosinophilia and Systemic Symptoms. — JAMA Dermatol, 2026-10-21 (PMID 42905682; literature)