High Hemoglobin Count - Mayo Clinic

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   1. Definition
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1. Definition
2. Causes
3. When to see a doctor

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Definition

By Mayo Clinic Staff

A high hemoglobin (Hb or Hgb) count is a blood test result. It means that the level of a key protein in red blood cells called hemoglobin is higher than is typical. Hemoglobin carries oxygen throughout the body. It also gives red blood cells their color.

Hemoglobin is measured in grams per deciliter (g/dL) of blood. What's considered a high hemoglobin count differs slightly from one lab to another. In general, a high hemoglobin count is more than 16.6 g/dL for men and more than 15 g/dL for women. In children, a high hemoglobin count varies with age and sex.

Other factors that can affect hemoglobin count include:

• The time of day.
• How hydrated you are.
• How high above sea level you are.

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Feb. 15, 2025 Show references

1. Hemoglobin. Testing.com. https://www.testing.com/tests/hemoglobin/. Accessed Aug. 9, 2024.
2. Complete blood count (CBC) with differential, blood. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/9109#Clinical-and-Interpretive. Accessed Aug. 9, 2024.
3. Blood tests. National Heart, Lung, and Blood Institute. https://www.nhlbi.nih.gov/health/blood-tests. Accessed Aug. 9, 2024.
4. Tefferi A. Clinical manifestations and diagnosis of polycythemia vera. https://www.uptodate.com/contents/search. Accessed Dec. 30, 2018.
5. Evaluation and management of testosterone deficiency (2024). American Urological Association. https://www.auanet.org/guidelines-and-quality/guidelines/testosterone-deficiency-guideline. Accessed Aug. 12, 2024.
6. Feather A, et al., eds. Haematology and oncology. In: Kumar & Clark's Clinical Medicine. 10th ed. Elsevier; 2021. https://www.clinicalkey.com. Accessed Aug. 9, 2024.
7. Martelli V, et al. Prevalence of elevated hemoglobin and hematocrit levels in patients with obstructive sleep apnea and the impact of treatment with continuous positive airway pressure: A meta-analysis. Hematology. 2022; doi:10.1080/16078454.2022.2109346.
8. Medical review (expert opinion). Mayo Clinic. Aug. 12, 2024.

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