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Disclaimer
                    GLOSSARY OF KEY TERMS                    The views expressed in this article are those of the authors and
                                                             do not reflect the official policy or position of the US Army or
          Co-oximetry. Blood test that reports percentages of various   Department of Defense.
          forms of hemoglobin including hemoglobin bound to carbon
          monoxide (carboxyhemoglobin) and hemoglobin containing   Author Contributions
          ferric iron (methemoglobin).                       All authors were directly involved in the clinical care and di-
                                                             agnosis of this patient. RE conducted a review of relevant lit-
          Cytochrome b5 reductase.  Also known as NADH-      erature and wrote the initial draft, and all authors edited and
          cytochrome  b5 reductase  3, a  soluble  enzyme  found  in red   approved the final manuscript.
          blood cells that protects the cell from oxidative stress by re-
          ducing methemoglobin (containing ferric iron) to normal he-  Disclosure
          moglobin (containing ferrous iron).                The authors have indicated that they have no financial rela-

          Force Health Protection Plan. “All measures taken by com-  tionships relevant to this article to disclose.
          manders, supervisors, individual Servicemembers, and the
          MHS to promote, protect, improve, conserve, and restore the   References
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