What is the role of the methemoglobin reduction test in the workup of glucose-6-phosphate dehydrogenase (G6PD) deficiency?

Updated: Jun 25, 2020
  • Author: Lawrence C Wolfe, MD; Chief Editor: George T Griffing, MD  more...
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Methemoglobin reduction test

This is a rapid indirect test that measures the reduced methemoglobin levels produced after NADPH oxidation. G6PD activity is assessed by first treating red blood cells with nitrite (converting oxyhemoglobin [red] to methemoglobin [brown]) and then examining the rate of NADPH-dependent methemoglobin reduction in the presence of an appropriate redox catalyst (Nile blue or methylene blue) and substrate (glucose). [6]

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