• Br J Anaesth · Mar 1988

    Case Reports

    Effect of methylene blue on the absorbance of solutions of haemoglobin.

    • E S Gorman and M R Shnider.
    • Department of Anesthesia, Harvard Medical School, Boston, MA.
    • Br J Anaesth. 1988 Mar 1;60(4):439-44.

    AbstractThe effect of the i.v. administration of methylene blue dye on haemoglobin oxygen saturation, measured by a pulse oximeter was investigated. The absorption spectra of various concentrations of haemoglobin, oxyhaemoglobin and methylene blue were compared. The amount of 660-nm light absorbed by methylene blue was sufficient to cause a factitious haemoglobin desaturation as measured by the pulse oximeter.

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