Hemoglobin is often abbreviated Hgb or Hb, either way it is the measurement of the oxygen-carrying component of the red blood cells. This number should be pretty close to being equal to the PCV divided by 3. I remember this because it rhymes: "Hb equals PCV over 3". This value is determined by the CBC machine.
Increased hemoglobin indicates:
-Machine error: there is no such thing as a real increase of hemoglobin.
Decreased hemoglobin indicates:
-Regenerative anemia: young RBC's don't have as much hemoglobin as mature cells. See MCV, reticulocytes, and NRBC's to confirm.
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