What Does Hemoglobin Do in Your Body?

Hemoglobin is a protein in red blood cells that plays a vital role in your overall health. Understanding what hemoglobin does can help you recognize signs of imbalance and take action before small issues become serious.

What Is Hemoglobin?

• A complex protein made of four subunits (globin chains)
• Each subunit contains a heme group, which holds an iron ion
• Found exclusively in red blood cells

Hemoglobin is responsible for carrying gases between your lungs and the rest of your body. Without it, tissues wouldn’t get the oxygen they need to function properly.

Key Functions: What Does Hemoglobin Do?

1. Oxygen Transport

   • In the lungs, hemoglobin binds to oxygen (O₂)
   • Each hemoglobin molecule can carry up to four oxygen molecules
   • Delivers oxygen to muscles, organs, and tissues

2. Carbon Dioxide Removal

   • Picks up about 20–30% of carbon dioxide (CO₂) produced by cells
   • Transports CO₂ back to the lungs for exhalation
   • Helps prevent harmful buildup of carbon dioxide in your bloodstream

3. Acid-Base Balance

   • Hemoglobin acts as a buffer by binding excess hydrogen ions
   • Maintains stable pH in your blood
   • Supports normal enzyme activity and cell function

4. Nitric Oxide Transport

   • Carries and releases nitric oxide, a molecule that widens blood vessels
   • Helps regulate blood pressure and flow
   • Improves oxygen delivery to tissues

Why Hemoglobin Levels Matter

Your hemoglobin concentration is measured in grams per deciliter (g/dL). Normal ranges vary slightly by age and sex:

• Men: 13.8 – 17.2 g/dL
• Women: 12.1 – 15.1 g/dL

Levels outside these ranges can signal an underlying health issue:

• Low hemoglobin (anemia): You may feel tired, weak or short of breath
• High hemoglobin (polycythemia): Blood can become too thick, raising the risk of clots

Low Hemoglobin: Understanding Anemia

Anemia occurs when your hemoglobin is below the normal range. Common causes include:

• Iron deficiency (most common)
• Vitamin B12 or folate deficiency
• Chronic kidney disease
• Inherited conditions (e.g., sickle cell disease, thalassemia)
• Chronic inflammation or infection

Symptoms of Anemia

• Persistent fatigue or lethargy
• Pale skin and nail beds
• Dizziness or lightheadedness
• Rapid or irregular heartbeat
• Cold hands and feet
• Headaches

Managing Low Hemoglobin

1. Identify the cause through blood tests
2. Adjust your diet or take supplements (iron, B12, folate) as prescribed
3. Treat underlying conditions (kidney disease, infections)
4. In severe cases, your doctor may recommend:
   • Intravenous iron therapy
   • Blood transfusions
   • Medications to stimulate red blood cell production

High Hemoglobin: Understanding Polycythemia

Polycythemia is when hemoglobin levels are abnormally high. It can be:

• Primary: A bone marrow disorder (polycythemia vera)
• Secondary: A response to low oxygen levels (smoking, high altitude, lung disease)

Symptoms of High Hemoglobin

• Headaches or dizziness
• Blurred vision
• Itchy skin, especially after a hot shower
• Reddened complexion
• High blood pressure
• Increased risk of blood clots

Managing High Hemoglobin

1. Treat the cause (quit smoking, adjust oxygen therapy)
2. Phlebotomy (removal of blood) to lower levels
3. Medications to reduce blood thickness or suppress bone marrow activity
4. Monitor your levels regularly with your healthcare provider

How Hemoglobin Is Tested

A routine complete blood count (CBC) measures hemoglobin along with other blood components. Your doctor may also order:

• Iron studies (serum iron, ferritin, total iron-binding capacity)
• Vitamin B12 and folate levels
• Kidney function tests
• Tests for underlying conditions (e.g., thyroid, inflammatory markers)

When to Seek Help

If you experience any of the following, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker, and then speak to a doctor:

• Unexplained fatigue or weakness
• Shortness of breath that interferes with daily life
• Sudden dizziness or fainting spells
• Persistent headaches or vision changes
• Signs of bleeding or easy bruising
• Chest pain or irregular heartbeat

A quick online check can guide you on the next steps, but it’s not a substitute for professional care. Always contact your healthcare provider if you believe you may have a serious condition.

Tips for Healthy Hemoglobin Levels

• Eat a balanced diet rich in iron (lean meats, beans, spinach)
• Include vitamin C sources (citrus fruits, bell peppers) to boost iron absorption
• Get enough B vitamins from whole grains, dairy, eggs and fortified foods
• Stay hydrated to support healthy blood volume
• Avoid smoking and limit alcohol intake
• Exercise regularly to stimulate healthy red blood cell production

Conclusion

Hemoglobin is essential for oxygen delivery, carbon dioxide removal, and maintaining a healthy blood pH. Understanding what does hemoglobin do helps you recognize symptoms of imbalance and take steps to correct them. If you suspect your hemoglobin levels are off, try a free, online symptom check, using the doctor approved Ubie Symptom Checker, and be sure to speak to a doctor about any concerns that could be life-threatening or serious. Taking action early can help you maintain energy, vitality and overall well-being.