![]() If the blood contains antibodies to HIV or antigens of HIV, it will bind with the antigen or antibody in the device. Afterward, the reaction of the blood and the antigen will be monitored. The enzyme helps speed up chemical reactions. A lab technician will add the sample to a device that contains HIV antigen and anti-HIV antibodies.Īn automated process will add an enzyme to the device. Testing the bloodįor the ELISA test, the blood sample will be sent to a laboratory for analysis. Their arm may throb slightly after the procedure. Giving a blood sample isn’t painful, though the person may feel a sting or a pricking sensation as the needle goes into their vein. To decrease further bleeding, after the test the person may be asked to elevate or flex their arm to reduce blood flow. place a needle into one of the veins and draw a small sample of blood into a tube.apply a tourniquet, or elastic band, around the arm to make the veins swell with blood.clean the skin site where they plan to draw blood.The procedure for getting a sample of blood is the same for both tests. they’re taking anticoagulant medications ( blood thinners).they have a bleeding disorder, such as hemophilia.they’ve had trouble giving blood in the past.To help prevent any problems during the test, the person should be sure to tell the healthcare provider if: The person having the test will probably need to sign a consent form. Before the test, a healthcare provider will explain the procedure. ![]()
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