The complete blood count (CBC) is a blood test used to screen your overall health and to look for many different illnesses, including anemia, infections, and leukemia. The test extracts a large amount of information from the blood sample you've given, including: Show
Why do I need this test?You may need this test if you have:
You may also have this test if your healthcare provider thinks you may have a certain disease or condition. Or you may have this test as part of a routine exam to check your health. The test may also be used to see how well certain treatments are working. What other tests might I have along with this test?Your healthcare provider may order other tests if your CBC results are abnormal. These may include other blood tests, urine tests, and bone marrow or spinal fluid tests. What do my test results mean?Test results may vary depending on your age, gender, health history, the method used for the test, and other things. Your test results may not mean you have a problem. Ask your healthcare provider what your test results mean for you. Although estimates vary from lab to lab, here are some typical normal ranges for the main parts of the CBC:
Abnormal test results can have many causes. Some of these causes might not be something that needs to be treated. The most common problem found through the CBC is mild anemia. You may have more testing, depending on how severe the anemia is and whether other problems crop up in the test. How is this test done?The test is done with a blood sample. A needle is used to draw blood from a vein in your arm or hand. Does this test pose any risks?Taking a blood sample with a needle carries risks that include bleeding, infection, bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight stinging sensation or pain. Afterward, the site may be slightly sore. What might affect my test results?Certain medicines might affect your results. Talk with your healthcare provider about the medicines you are taking. How do I get ready for this test?You don't need to prepare for this test. Be sure your healthcare provider knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illegal drugs you may use. What does it mean when your white and red blood cell count is high?Leukocytosis, or high white blood cell count, can indicate a range of conditions, including infections, inflammation, injury and immune system disorders. A complete blood count (CBC) is usually performed to check for leukocytosis. Treating the underlying condition usually reduces your white blood cell count.
Should I be worried about high red blood cell count?A high red blood cell count can be a sign of: Dehydration. Heart disease. Polycythemia vera, a bone marrow disease that causes too many red blood cells to be made.
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