Complete blood count
A complete blood count (CBC) is a widely used laboratory test that analyzes the composition of the blood. It is an important tool for diagnosing various health conditions and monitoring a person's overall well-being.
The test measures several blood components, including red blood cells, white blood cells, and platelets. Red blood cells contain hemoglobin, which carries oxygen throughout the body. White blood cells (made up of neutrophils, eosinophils, basophils, lymphocytes, and monocytes) play a role in the immune system by fighting infections. Lastly, platelets are responsible for blood clotting.
The CBC provides valuable information about the number of blood cells, their size and shape, and other parameters. Changes in these values can indicate health problems such as anemia, infection, clotting disorders, and other medical conditions.
| What is the purpose of this test? | A health care professional may order a complete blood count for many reasons, including:
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| How to prepare? | No preparation needed. |
| Tests typically included | A CBC includes the measurement of several parameters, such as:
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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. |
Factors that may affect test results
In addition to the various diseases or health conditions that can cause a complete blood count to vary, there are other factors that can affect the results:
- Dehydration, diarrhea, or vomiting
- Malnutrition
- Severe physical or psychological stress (e.g., fever, surgery)
- Certain medications
- Bleeding
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.