Or you might feel a quick sting or pinch. There is very little chance of having a problem from this test. When a blood sample is taken, a small bruise may form at the site. Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors.
A value that isn't in the normal range may still be normal for you. Normal values for the complete blood count CBC tests depend on age, sex, how high above sea level you live, and the type of blood sample. Your doctor may use all the CBC values to check for a condition. For example, the red blood cell RBC count, hemoglobin Hgb , and hematocrit HCT are the most important values needed to tell whether a person has anemia.
But the red blood cell indices and the blood smear also help with the diagnosis and may show a possible cause for the anemia. To see if the white blood cell WBC, leukocyte count is good and how the cells look on the smear, your doctor will look at both the number WBC count and the WBC differential.
To see whether there are too many or too few of a certain type of cell, your doctor will look at the total count and the percentage of that particular cell. There are normal values for the total number of each type of white cell. Pregnancy can change these blood values. Your doctor will talk with you about normal values during each trimester of your pregnancy. Current as of: September 23, Gabica MD - Family Medicine. Author: Healthwise Staff. Medical Review: E. This information does not replace the advice of a doctor.
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Learn how we develop our content. To learn more about Healthwise, visit Healthwise. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. Updated visitor guidelines. Top of the page. Test Overview A complete blood count CBC gives important information about the kinds and numbers of cells in the blood, especially red blood cells , white blood cells , and platelets.
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Manage Your Award. Grants Management Contacts. Prior Approvals. If your child is anxious, talk with the doctor before the test about ways to make the procedure easier. A small bruise or mild soreness around the blood test site is common and can last for a few days. Get medical care for your child if the discomfort gets worse or lasts longer. If you have questions about the CBC, speak with your doctor or the health professional doing the blood draw. Larger text size Large text size Regular text size.
What Is a Blood Test? What Is a Complete Blood Count? A CBC measures: red blood cells, which deliver oxygen to the different parts of the body white blood cells, which help fight infections platelets, which help blood clot to stop bleeding Why Are CBCs Done? To do that, a health professional will: clean the skin put an elastic band tourniquet above the area to get the veins to swell with blood insert a needle into a vein usually in the arm inside of the elbow or on the back of the hand pull the blood sample into a vial or syringe take off the elastic band and remove the needle from the vein In babies, blood draws are sometimes done as a "heel stick collection.
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.
There are five major types of white blood cells. A CBC test measures the total number of white cells in your blood. A test called a CBC with differential also measures the number of each type of these white blood cells Platelets , which help your blood to clot and stop bleeding Hemoglobin , a protein in red blood cells that carries oxygen from your lungs and to the rest of your body Hematocrit , a measurement of how much of your blood is made up of red blood A complete blood count may also include measurements of chemicals and other substances in your blood.
Other names for a complete blood count: CBC, full blood count, blood cell count. What is it used for?
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