A low hemoglobin count is a commonly seen blood test result. Hemoglobin (Hb or Hgb) is a protein in red blood cells that carries oxygen throughout the body.
In many cases, a low hemoglobin count is only slightly lower than normal and doesn't affect how you feel. If it gets more severe and causes symptoms, your low hemoglobin count may indicate you have anemia.
A low hemoglobin count is generally defined as less than 13.5 grams of hemoglobin per deciliter (135 grams per liter) of blood for men and less than 12 grams per deciliter (120 grams per liter) for women. In children, the definition varies with age and sex. The threshold differs slightly from one medical practice to another.
April 07, 2018
- Hemoglobin. Lab Tests Online. www.labtestsonline.org. Accessed March 12, 2015.
- McPherson RA, et al. Erythrocytic disorders. In: Henry's Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, Pa.: Saunders Elsevier; 2011. www.clinicalkey.com. Accessed March 13, 2015.
- Anemia in people with cancer. American Cancer Society. http://www.cancer.org/treatment/treatmentsandsideeffects/physicalsideeffects/anemia/anemia-in-people-with-cancer. Accessed March 12, 2015.
- Goldman L, et al. Approach to the anemias. In: Goldman's Cecil Medicine. 24th ed. Philadelphia, Pa.: Saunders Elsevier, 2012. http://www.clinicalkey.com. Accessed March 12, 2015.
- Schrier SL. Approach to the adult patient with anemia. http://www.uptodate.com/home. Accessed March 12, 2015.
- Friel TJ, et al. Hematologic manifestations of HIV infection: Anemia. http://www.uptodate.com/home. Accessed March 13, 2015.
- Kellerman RD. Hematology. In: Conn's Current Therapy 2015. Philadelphia, Pa.: Saunders Elsevier; 2015. www.clinicalkey.com. Accessed March 12, 2015.