A Complete Blood Count (hemogram) test is typically performed under the guidance of an Internal Medicine specialist. For this test, a blood sample is taken into a special tube from a vein in your arm or hand, a fingertip, or from the heel in newborn babies. The steps for performing the test are as follows:
1. Patient Preparation: The person from whom blood will be drawn is made comfortable in a sitting or lying position. The area from which blood will be taken is supported on a stable surface.
2. Site Cleaning: The site for blood collection is wiped with an antiseptic solution and allowed to dry. The cleaned area should not be touched during this time.
3. Tourniquet Application: If blood is to be drawn from the arm, a tourniquet is applied 10-15 cm above the elbow to make the veins more prominent.
4. Blood Sample Collection: A sterile, single-use syringe or a vacuum blood collection system is gently inserted into the appropriate vein, and a sufficient amount of blood is drawn into special test tubes.
5. Post-Procedure Care: Once blood collection is complete, the tourniquet is released, and the needle is withdrawn. Gentle pressure is applied to the blood collection site with a clean cotton swab or gauze for approximately 10 minutes. This application is done to stop bleeding and prevent bruising. The patient is informed that they should continue to apply pressure to the blood collection site.