Blood testing is one way of telling your health care professional steps that he should recommend protecting your health and enhancing your well-being. Blood tests are the most common types of medical tests and offer a wide range of uses. A blood test can be used for assessing your overall health, detecting the presence of viral or bacterial infection, checking if your vital organs are functioning properly and screening certain genetic conditions.
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. 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. If you're getting a few blood tests, more than one test tube may be attached to the needle before it's withdrawn.
Some people get nervous about blood tests because they're afraid of needles. Others may not want to see blood leaving their bodies. If you're nervous or scared, it can help to look away or talk to someone to distract yourself. You might feel a slight sting when the needle goes in or comes out. Drawing blood usually takes less than 3 minutes.
A small amount of blood is taken for the test and you shouldn't feel any significant after-effects. Some people do feel dizzy and faint during and after the test. If it happens during the test or immediately after, report to it to the person carrying out and they will make you feel more comfortable.
You may have a small bruised area on your skin where the needle went in. The bruising area may appear larger because of a lack of pressure at the site of the jab. Tell your GP if you frequently get bruises after having a blood test.
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