Blood keeps your body working to its maximum potential by delivering essential nutrients and oxygen to the cells. Then, it removes the waste, or carbon dioxide, and transports it to body organs and the digestive system.
Blood work may be done at a medical facility, healthcare provider's office or blood lab. The lab technician, or phlebotomist, usually draws blood from a vein in your arm and follow the orders on your doctor's blood test prescription. Your doctor can order any of thousands of different blood tests.
The complete blood count (CBC) is one of the most common with most physicians requesting the results from a CBC for a routine health exam. This test also provides additional information about the blood makeup and organ functions of people who aren't feeling well. The CBC shows the number of white blood cells in your blood sample. These white blood cells defend your body against infections, allergies and parasites. People produce a greater number of white blood cells when they have an infection or allergic reaction. The CBC also evaluates the red blood cells, which transport oxygen from one part of the body to another. From this blood work, your healthcare provider also learns the number of platelets, or the cell fragments that are needed for blood clotting.