One, called venipuncture, involves drawing a vial of blood from a vein, usually on the inner surface of your arm near your elbow. The other, called a finger stick, is done by pricking your finger with a sharp blade to obtain a small amount of blood from a capillary.
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What It's Used For. Blood tests can be used to screen for a wide variety of diseases and disorders. They are also used to determine how well treatment is working for many different conditions. The kinds of problems for which doctors order blood tests include: Allergies. Anemia. Chemical balances in the body.
https://www.drugs.com/health-guide/blood-testing.html
Other blood tests require fasting (not eating any food) for 8 to 12 hours before the test. Your doctor will tell you how to prepare for your blood test(s). Blood usually is drawn from a vein in your arm or other part of your body using a needle.
https://www.nhlbi.nih.gov/health/health-topics/topics/bdt/with
Blood withdrawn from one of the arm veins is then injected directly into the tendon. The amount of blood injected depends on the size of the tendon. The procedure is at this point over and the needle injection site is then dressed with a small bandage.
http://www.melbourneradiology.com.au/fact-sheets/autologous-blood-injection-platelet-rich-plasma-injection.html
After your body's organs and tissues have used the oxygen in your blood, the vena cavae carry the oxygen-poor blood back to the right atrium of your heart. The superior vena cava carries oxygen-poor blood from the upper parts of your body, including your head, chest, arms, and neck.
https://www.nhlbi.nih.gov/health/health-topics/topics/hhw/anatomy
Anatomy of the Heart. Your heart is located under your ribcage in the center of your chest between your right and left lungs. Its muscular walls beat, or contract, pumping blood to all parts of your body. The size of your heart can vary depending on your age, size, and the condition of your heart. A normal, healthy, adult heart usually is the size of an average clenched adult fist. Some diseases can cause the heart to enlarge.
https://www.nhlbi.nih.gov/health/health-topics/topics/hhw/anatomy
What To Expect During Blood Tests. Blood usually is drawn from a vein in your arm or other part of your body using a needle. It also can be drawn using a finger prick. The person who draws your blood might tie a band around the upper part of your arm or ask you to make a fist.
https://www.nhlbi.nih.gov/health/health-topics/topics/bdt/with
Platelet Rich Plasma Injection. A PRP injection is similar to an ABI, with the only difference being that a larger amount of blood is withdrawn from an arm vein. The blood is then placed into a tube, which in turn is placed into a machine called a centrifuge, which spins many thousand times a minute. The blood is left to spin for 15 minutes.
http://www.melbourneradiology.com.au/fact-sheets/autologous-blood-injection-platelet-rich-plasma-injection.html
While you are able to draw blood from any site in the body that has good veins that are easily visualized, the arm is generally preferred as it is readily accessed, can be quickly cleaned, and does not impede with the life of the person after the draw.
https://www.zocdoc.com/answers/6597/from-where-can-a-doctor-draw-a-blood-sample-other-than-the-arm
Doing this can make the veins in your arm stick out more, which makes it easier to insert the needle. The needle that goes into your vein is attached to a small test tube. The person who draws your blood removes the tube when it's full, and the tube seals on its own. The needle is then removed from your vein.
https://www.nhlbi.nih.gov/health/health-topics/topics/bdt/with
what is the part on your arm where they draw blood called
The part on your arm where they draw blood is called the inner surface of your arm near your elbow. On the inner surface of your arm near your elbow they draw blood. On the inner surface of your arm near your elbow is the part on your arm where they draw blood.