You may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly. A CBC counts the cells and measures the levels of different substances in your blood. There are many reasons your levels may fall outside the normal range.
For instance:. If any of your levels are abnormal, it does not necessarily indicate a medical problem needing treatment. Diet, activity level, medications, a women's menstrual cycle, and other considerations can affect the results.
Talk to your health care provider to learn what your results mean. Learn more about laboratory tests, reference ranges, and understanding results. A complete blood count is only one tool your health care provider uses to learn about your health.
Your medical history, symptoms, and other factors will be considered before a diagnosis. Additional testing and follow-up care may also be recommended. The information on this site should not be used as a substitute for professional medical care or advice. Contact a health care provider if you have questions about your health. What is a complete blood count? A complete blood count or CBC is a blood test that measures many different parts and features of your blood, including: Red blood cells , which carry oxygen from your lungs to the rest of your body White blood cells , which fight infection.
Your doctor will explain your results and advise if any follow-up is needed. Having CBC lab work done poses very little risk to your health. However, anytime the skin is broken even by a sterilized needle , there is always a slight risk of infection. You should also keep in mind that some blood may pool under the skin, causing a bruise after the test. If you are scared of needles, you may experience general anxiety about the test.
Some people who are prone to fainting may faint during the test or can feel lightheaded. In rare cases, excessive bleeding can be a more serious response to the test.
Abnormal test results could be an indication of a serious health problem or a simple one that can be remedied by eating better or taking supplements. These are some of the health problems that can be identified by a CBC:.
Last Updated: September 8, This information provides a general overview and may not apply to everyone. Talk to your family doctor to find out if this information applies to you and to get more information on this subject. However, if you have to travel, there are ways to decrease…. Visit The Symptom Checker. Read More. Blood Test: Lipid Panel. Pelvic Ultrasound. Rapid Strep Test. Abdominal Ultrasound. CT Head Scan.
Juice, coffee, soda, and other beverages can get in your bloodstream and affect your results. In addition, you should not :. But you can drink water. It's actually good to drink water before a blood test. It helps keep more fluid in your veins, which can make it easier to draw blood. Ask your health care provider. Most of the time it's OK to take your usual medicines, but you may need to avoid certain medicines, especially if they need to be taken with food.
Tell your health care provider before your test. He or she can reschedule the test for another time when you are able to complete your fast. Be sure to talk to your health care provider if you have any questions or concerns about fasting. You should talk to your provider before taking any lab test. Most tests don't require fasting or other special preparations.
For others, you may need to avoid certain foods, medicines, or activities. Taking the right steps before testing helps ensure your results will be accurate. The information on this site should not be used as a substitute for professional medical care or advice. Contact a health care provider if you have questions about your health.
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