Complete Blood Count (CBC)
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 infections and other diseases.
There are five major types of white blood cells. A CBC test measures the total number of white cells in your blood. A different test called a CBC with differential measures the number of each type of these white blood cells.
Platelets, which stop bleeding by helping your blood to clot.
Hemoglobin, a protein in red blood cells that carries oxygen from your lungs to the rest of your body.
Hematocrit, a measurement of how much of your blood is made up of red blood cells.
Mean corpuscular volume (MCV), a measure of the average size of your red blood cells.
Other names for a complete blood count: CBC, full blood count, blood cell count
What is it used for?
A complete blood count is a common blood test that is often part of a routine checkup. Complete blood counts can help detect a variety of disorders including infections, anemia, diseases of the immune system, and blood cancers.:
Help diagnose blood diseases, infection, immune system disorders, or other medical conditions
Check for changes in an existing blood disorder
What do the results mean?
A CBC counts the cells in your blood. There are many reasons your levels may not be in the normal range.
For example:
*Abnormal levels of red blood cells, hemoglobin, or hematocrit may be a sign of anemia, heart disease, or too little iron in your body.
*Low white cell count may be a sign of an autoimmune disorder, bone marrow disorder, or cancer.
*High white cell count may be a sign of an infection or a reaction to medicine.
If any of your levels are abnormal, it doesn't always mean you have a medical condition that needs treatment. Diet, activity level, medicines, a menstrual period, not drinking enough water, and other factors can affect the results.
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