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Hemoglobin Levels (cont.)

How is hemoglobin measured?

Hemoglobin is routinely measured as part of a routine blood test termed complete blood count (CBC). A complete blood count is one of the most common tests doctors order for a patient. It is done on automated machines that use a blood sample that is chemically treated to release hemoglobin from red blood cells. The released hemoglobin then is bound chemically to cyanide that forms a compound that absorbs light. The amount of absorbed light is then measured, and this measurement is directly related to how much hemoglobin is present in the blood.

Picture of Red Blood Cells

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