Nursing Central: Methemoglobin

Methemoglobin

General

Synonym/Acronym:
Hemoglobin, hemoglobin M, MetHb, Hgb M.

Common Use:
To assess for cyanosis and hypoxemia associated with polycythemia, pathologies affecting hemoglobin, and potential inhaled drug toxicity.

Specimen:
Whole blood (1 mL) collected in green-top (heparin) tube. Specimen should be transported tightly capped and in an ice slurry.

Normal Findings:
(Method: Spectrophotometry)

Conventional Units	SI Units (Conventional Units × 155)
0.06–0.24 g/dL*	9.3–37.2 micromol/L*
*Percentage of total hemoglobin = 0.41–1.15%.Note: The conversion factor of ×155 is based on the molecular weight of hemoglobin of 64,500 daltons (d), or 64.5 kd.

Methemoglobin has been found in Davis's Lab & Diagnostic Tests

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