A high hemoglobin count indicates an above-normal level of hemoglobin in your blood. Hemoglobin (often abbreviated as Hb or Hgb) is the oxygen-carrying component of red blood cells.

A high hemoglobin count is somewhat different from a high red blood cell count, because each cell may not have the same amount of hemoglobin proteins. Therefore, you could have a high hemoglobin count even if your red blood cell count falls within the normal range.

The threshold for a high hemoglobin count is slightly different from one medical practice to another. It's generally defined as more than 17.5 grams (g) of hemoglobin per deciliter (dL) of blood for men and 15.5 g/dL for women. In children, the definition of a high hemoglobin count varies with age and sex. Hemoglobin count may also vary due to time of day and how well-hydrated you are.

Jan. 14, 2016