Increasing concentrations of methemoglobin cause increasing color change of the blood

Samples of blood with varying methemoglobin levels displayed on white, absorbent material.

Reproduced from: Shihana F, Dissanayake DM, Buckley NA, Dawson AH. A simple quantitative bedside test to determine methemoglobin. Ann Emerg Med 2010; 55:184. Illustration used with the permission of Elsevier Inc. All rights reserved.

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