BACK TOTOP Browse A-ZSearchBrowse A-ZABCDEFGHIJKLMNOPQRSTUVWXYZ0-9 E-mail FormEmail ResultsName:Email address:Recipients Name:Recipients address:Message: Print-FriendlyBookmarksbookmarks-menuHemoglobinHgb; Hb; Anemia - Hb; Polycythemia - HbHemoglobin is a protein in red blood cells that carries oxygen. The hemoglobin test measures how much hemoglobin is in your blood. How the Test is Performed A blood sample is needed.Blood sampleVenipuncture is the collection of blood from a vein. It is most often done for laboratory testing.ImageRead Article Now Book Mark Article How to Prepare for the Test No special preparation is necessary. How the Test will Feel When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away. Why the Test is Performed The hemoglobin test is a common test and is almost always done as part of a complete blood count (CBC). Reasons or conditions for ordering the hemoglobin test include:Complete blood countA complete blood count (CBC) test measures the following:The number of white blood cells (WBC count)The number of red blood cells (RBC count)The numb...ImageRead Article Now Book Mark Article Before and after major surgery Blood in your stools, or vomit (if you throw up) Chronic medical problems, such as kidney disease or certain types of arthritis During pregnancy Fatigue, poor health, or unexplained weight loss Headaches Heavy menstrual periods Leukemia or other problems in the bone marrow Monitoring during treatment for cancer Monitoring medicines that may cause anemia or low blood counts Monitoring of anemia and its cause Poor nutrition Problems concentrating Normal Results Normal results for adults vary, but in general are:Male: 13.8 to 17.2 grams per deciliter (g/dL) or 138 to 172 grams per liter (g/L) Female: 12.1 to 15.1 g/dL or 121 to 151 g/LNormal results for children vary, but in general are:Newborn: 14 to 24 g/dL or 140 to 240 g/L Infant: 9.5 to 13 g/dL or 95 to 130 g/LThe ranges above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your health care provider about the meaning of your specific test results. What Abnormal Results Mean LOWER THAN NORMAL HEMOGLOBINLow hemoglobin level may be due to:Anemia Bleeding Bone marrow being unable to produce new red blood cells. This may be due to leukemia, other cancers, drug toxicity, radiation therapy, infection, or bone marrow disorders LeukemiaLeukemia is a type of blood cancer that begins in the bone marrow. Bone marrow is the soft tissue in the center of the bones, where blood cells are ...ImageRead Article Now Book Mark Article Chronic illness Chronic kidney disease Destruction of red blood cells (hemolysis) Leukemia Malnutrition Too little iron, folate, vitamin B12, and vitamin B6 in the diet FolateFolic acid and folate are both terms for a type of B vitamin (vitamin B9). Folate is a B vitamin that occurs naturally in foods such as green leafy v...ImageRead Article Now Book Mark Article Vitamin B12Vitamin B12 is a water-soluble vitamin. Water-soluble vitamins dissolve in water. After the body uses these vitamins, leftover amounts leave the bo...ImageRead Article Now Book Mark Article Vitamin B6Vitamin B6 is a water-soluble vitamin. Water-soluble vitamins dissolve in water so the body cannot store them. Leftover amounts of the vitamin leav...ImageRead Article Now Book Mark Article Too much water in the bodyHIGHER THAN NORMAL HEMOGLOBINHigh hemoglobin level is most often caused by low oxygen levels in the blood (hypoxia), present over a long period of time. Common reasons include:Bone marrow disease that causes abnormal increase in red blood cells (polycythemia vera) Congenital heart disease Congenital heart diseaseCongenital heart disease (CHD) is a problem with the heart's structure and function that is present at birth.ImageRead Article Now Book Mark Article Exposure to high altitude Failure of the right side of the heart Low levels of oxygen in the blood Scarring or thickening of the lungs Too little water in the body (dehydration) Risks There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.Other risks associated with having blood drawn are slight, but may include:Excessive bleeding Fainting or feeling lightheaded Multiple punctures to locate veins Hematoma (blood buildup under the skin) Infection (a slight risk any time the skin is broken) Open ReferencesReferencesChernecky CC, Berger BJ. Hemoglobin (HB, Hgb). In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. Philadelphia, PA: Elsevier; 2013:621-623.Marcdante KJ, Kliegman RM, Schuh AM. Hematology assessment. In: Marcdante KJ, Kliegman RM, Schuch AM, eds. Nelson Essentials of Pediatrics. 9th ed. Elsevier; 2023:chap 149.Means RT. Approach to the anemias. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 149.AllVideoImagesTogHemoglobin - illustration Hemoglobin is the most important component of red blood cells. It is composed of a protein called heme, which binds oxygen. In the lungs, oxygen is exchanged for carbon dioxide. Abnormalities of an individual's hemoglobin value can indicate defects in the normal balance between red blood cell production and destruction. Both low and high values can indicate disease states.HemoglobinillustrationHemoglobin - illustration Hemoglobin is the most important component of red blood cells. It is composed of a protein called heme, which binds oxygen. In the lungs, oxygen is exchanged for carbon dioxide. Abnormalities of an individual's hemoglobin value can indicate defects in the normal balance between red blood cell production and destruction. Both low and high values can indicate disease states.Hemoglobinillustration Tests for Hemoglobin HemoglobinHemoglobinuria testHemoglobin electrophoresisSerum free hemoglobin testAbnormal hemoglobins testingRelated Information CBC blood test(Medical Test)Hemoglobin electrophoresis(Medical Test)Anemia(Condition)Erythropoietin test(Medical Test)Hemolysis(Special Topic)Hemolytic transfusion reaction(Condition)Bleeding(Injury)Lead poisoning(Poison)Malnutrition(Condition)Folic acid in diet(Nutrition)Anemia - InDepth(In-Depth)Vitamins and Phytonutrients - InDepth(In-Depth)Heart failure - InDepth(In-Depth) Review Date: 1/9/2022 Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. 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HemoglobinHgb; Hb; Anemia - Hb; Polycythemia - HbHemoglobin is a protein in red blood cells that carries oxygen. The hemoglobin test measures how much hemoglobin is in your blood. How the Test is Performed A blood sample is needed.Blood sampleVenipuncture is the collection of blood from a vein. It is most often done for laboratory testing.ImageRead Article Now Book Mark Article How to Prepare for the Test No special preparation is necessary. How the Test will Feel When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away. Why the Test is Performed The hemoglobin test is a common test and is almost always done as part of a complete blood count (CBC). Reasons or conditions for ordering the hemoglobin test include:Complete blood countA complete blood count (CBC) test measures the following:The number of white blood cells (WBC count)The number of red blood cells (RBC count)The numb...ImageRead Article Now Book Mark Article Before and after major surgery Blood in your stools, or vomit (if you throw up) Chronic medical problems, such as kidney disease or certain types of arthritis During pregnancy Fatigue, poor health, or unexplained weight loss Headaches Heavy menstrual periods Leukemia or other problems in the bone marrow Monitoring during treatment for cancer Monitoring medicines that may cause anemia or low blood counts Monitoring of anemia and its cause Poor nutrition Problems concentrating Normal Results Normal results for adults vary, but in general are:Male: 13.8 to 17.2 grams per deciliter (g/dL) or 138 to 172 grams per liter (g/L) Female: 12.1 to 15.1 g/dL or 121 to 151 g/LNormal results for children vary, but in general are:Newborn: 14 to 24 g/dL or 140 to 240 g/L Infant: 9.5 to 13 g/dL or 95 to 130 g/LThe ranges above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your health care provider about the meaning of your specific test results. What Abnormal Results Mean LOWER THAN NORMAL HEMOGLOBINLow hemoglobin level may be due to:Anemia Bleeding Bone marrow being unable to produce new red blood cells. This may be due to leukemia, other cancers, drug toxicity, radiation therapy, infection, or bone marrow disorders LeukemiaLeukemia is a type of blood cancer that begins in the bone marrow. Bone marrow is the soft tissue in the center of the bones, where blood cells are ...ImageRead Article Now Book Mark Article Chronic illness Chronic kidney disease Destruction of red blood cells (hemolysis) Leukemia Malnutrition Too little iron, folate, vitamin B12, and vitamin B6 in the diet FolateFolic acid and folate are both terms for a type of B vitamin (vitamin B9). Folate is a B vitamin that occurs naturally in foods such as green leafy v...ImageRead Article Now Book Mark Article Vitamin B12Vitamin B12 is a water-soluble vitamin. Water-soluble vitamins dissolve in water. After the body uses these vitamins, leftover amounts leave the bo...ImageRead Article Now Book Mark Article Vitamin B6Vitamin B6 is a water-soluble vitamin. Water-soluble vitamins dissolve in water so the body cannot store them. Leftover amounts of the vitamin leav...ImageRead Article Now Book Mark Article Too much water in the bodyHIGHER THAN NORMAL HEMOGLOBINHigh hemoglobin level is most often caused by low oxygen levels in the blood (hypoxia), present over a long period of time. Common reasons include:Bone marrow disease that causes abnormal increase in red blood cells (polycythemia vera) Congenital heart disease Congenital heart diseaseCongenital heart disease (CHD) is a problem with the heart's structure and function that is present at birth.ImageRead Article Now Book Mark Article Exposure to high altitude Failure of the right side of the heart Low levels of oxygen in the blood Scarring or thickening of the lungs Too little water in the body (dehydration) Risks There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.Other risks associated with having blood drawn are slight, but may include:Excessive bleeding Fainting or feeling lightheaded Multiple punctures to locate veins Hematoma (blood buildup under the skin) Infection (a slight risk any time the skin is broken) Open ReferencesReferencesChernecky CC, Berger BJ. Hemoglobin (HB, Hgb). In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. Philadelphia, PA: Elsevier; 2013:621-623.Marcdante KJ, Kliegman RM, Schuh AM. Hematology assessment. In: Marcdante KJ, Kliegman RM, Schuch AM, eds. Nelson Essentials of Pediatrics. 9th ed. Elsevier; 2023:chap 149.Means RT. Approach to the anemias. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 149.