High HB in blood

A have a high HB of 18.5 and before donating blood I was rejected on its behalf . I want to know is a high HB a problem ?
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Doctor Answers (1) on High HB in blood

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Dr. Chethan R S Bangalore | General Physician
Hi, A high hemoglobin count indicates an above-average concentration of the oxygen-carrying protein hemoglobin in your blood. Hemoglobin (Hg or Hgb) is the main component of red blood cells. 

Some causes for high hemoglobin levels are as follows:
Living at a high altitude.
Lung disease (Emphysema, COPD).
Tobacco smoking.
Bone marrow disorders (polycythaemia vera).
Overdose or inappropriate use of the drug.
Blood doping (adding RBC's by IV to the bloodstream).
A high hemoglobin count is rarely an unexpected finding or simply discovered by chance. A high hemoglobin count and results from other tests may already indicate the cause of your illness.

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