Indicator Explainer
Methemoglobin
A product of hemoglobin produced by oxidation of the iron atom from the ferrous to the ferric state.
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, C86008. 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
Related Tests
Tests that measure or involve this indicator.
References
- NCI Thesaurus 26.09d — Methemoglobin (C86008)
- Source: National Cancer Institute, NCI Thesaurus 26.09d, C86008. NCI definition, reproduced without modification under CC BY 4.0.
- Post-mortem methemoglobinemia: A retrospective analysis of forensic autopsy cases with elevated methemoglobin levels. — J Forensic Leg Med, 2026-09-17 (PMID 42759419; literature)
- Evaluation of PEGylated Methemoglobin for Sequestration of Cyanide, Azide, and Sulfide in In Vitro Binding Models. — ACS Appl Bio Mater, 2026-09-01 (PMID 42615382; literature)
- Prospective Assessment of Carboxyhemoglobin and Methemoglobin Levels in Operating Room Personnel During HIPEC/Peritonectomy Compared with Standard Colorectal Surgery. — J Clin Med, 2026-08-29 (PMID 42739717; literature)
- Gentamicin Targeting Human Hemoglobin Induces Methemoglobin Formation and Decreases Oxygen Affinity: A Molecular Mechanism of Hematologic Toxicity. — Int J Mol Sci, 2026-08-29 (PMID 42737656; literature)