Hemoglobin
Hemoglobin is a protein found in red blood cells. Its function is to transport oxygen from the lungs to the cells. It also gives blood its red colour.
The hemoglobin test measures the amount of hemoglobin in your blood. It is part of a complete blood count to assess overall health.
| What is the purpose of this test? | This test is done for several reasons:
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| How to prepare? | No preparation needed. |
| Reference values* |
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| Associated tests | The other tests in a complete blood count are performed at the same time. These tests measure different parts and features of your blood, including the following:
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| How is it done? | A blood sample is drawn, usually from a vein in the arm |
| How long before I get the results? | Results are usually ready in a day. It may take longer to receive your results. |
What does an abnormal test result mean?
Hemoglobin test results can't be interpreted on their own. Evaluating the results of the other tests typically carried out at the same time is essential to determine the possible cause of abnormal values.
High hemoglobin values:
- Overproduction of red blood cells
- Dehydration
- Lung or heart disease
Low hemoglobin values:
Indication of anemia caused by any of the following:
- Red blood cell destruction
- Abnormal red blood cell shape
- Lack of certain minerals or vitamins
- Bone marrow or kidney disorders
- Chronic inflammatory diseases
- Blood loss (e.g., digestive bleeding)
Factors that can interfere with test accuracy
- Certain medications (e.g., human erythropoietin)
- Spending time at high altitudes
- Smoking
- Age
- Pregnancy
What you should know before going for this test
When you go in for a blood test or any other medical exam, it's always a good idea to bring a complete list of any prescriptions, over-the-counter medications, or natural health products you're taking. Unless otherwise advised, it's best to take your medications as usual on blood test days. If in doubt, don't hesitate to talk to your healthcare professional.
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The patient information leaflets are provided by Vigilance Santé Inc. This content is for information purposes only and does not in any manner whatsoever replace the opinion or advice of your health care professional. Always consult a health care professional before making a decision about your medication or treatment.