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Methemoglobinemia occurs from acquired or hereditary causes with diverse treatment considerations, while true sulfhemoglobinemia is only acquired and treatment is restricted to toxin removal. Some toxic exposures can result in a dual increase in MetHb and SHb. Hereditary conditions, such as M\u2010Hemoglobin variants (M\u2010Hbs), can result in increased MetHb and\/or SHb values but are clinically compensated and do not require treatment if they are cyanotic but otherwise clinically well.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Herein, we report 53 hemoglobin variant cases that have associated MetHb and SHb levels measured by an adapted Evelyn\u2010Malloy laboratory assay method.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Our data indicate M\u2010Hbs cause variable patterns of MetHb and SHb elevation in a fairly reproducible pattern for the particular variant. In particular, \u03b1 globin chain M\u2010Hbs can mimic acquired sulfhemoglobinemia due to an isolated increased SHb value.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>If the patient appears clinically well other than cyanosis, M\u2010Hbs should be considered early in the evaluation process to differentiate from acquired conditions to avoid unnecessary testing and treatment regimens and prompt genetic counseling.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ijlh.13581","type":"journal-article","created":{"date-parts":[[2021,6,6]],"date-time":"2021-06-06T15:40:34Z","timestamp":1622994034000},"page":"837-844","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Interpreting sulfhemoglobin and methemoglobin in patients with cyanosis: An overview of patients with M\u2010hemoglobin 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