A complete blood cell count performs 6 tests to analyze the blood:
No special preparation is needed on the part of the patient. Just before the test, a rubber strap is gently tied around the upper arm to mildly restrict the flow of blood and keep blood in the vein. Then, a needle with a tube-like container attached is inserted into a vein near the bend of the elbow or on the top of the hand. After a sufficient sample of blood is obtained, the needle is withdrawn and a band-aid is placed over the puncture to give firm pressure until bleeding stops. The entire procedure takes less than 5 minutes. There is little discomfort or bleeding after the test.
An alternative method for drawing blood is pricking a finger. This method is often used in newborn infants and smaller children whose veins may be difficult to find.
After the test, slight bruising may occur at the site of the needle stick. Keep the puncture site clean. Any signs of infection such as redness, tenderness, or pain should be immediately reported to your healthcare provider.
Disclaimer: This content is reviewed periodically and is subject to change as new health information becomes available. The information provided is intended to be informative and educational and is not a replacement for professional medical evaluation, advice, diagnosis or treatment by a healthcare professional.