A relatively nontoxic compound of cyanide with methemoglobin, which is formed when methylene blue is administered in cases of cyanide poisoning. SYN: cyanide methemoglobin.

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cy·an·met·he·mo·glo·bin (si″an-met-heґmo-glo″bin) a tightly bound complex of methemoglobin with the cyanide ion. The standard method of hemoglobinometry (measuring hemoglobin content) is determination of the amount of this compound via spectrophotometry; cyanmethemoglobin is produced quantitatively from oxyhemoglobin, deoxyhemoglobin, carboxyhemoglobin, and methemoglobin (but not sulfhemoglobin) by addition of Drabkin solution.

Medical dictionary. 2011.

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