![]() ![]() Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. Depending on the reasons for checking your A/G ratio, and your results, your doctor might also order this test. Once the blood draw process begins, it usually only takes several seconds to complete. You may have an elastic band tied around your arm above the vein, or be asked to squeeze a stress ball, to increase blood flow. After the samples are collected, the technician will remove the needle and apply pressure to the site. ![]() If multiple samples are needed, the technician will replace the test tubes multiple times as they fill up.The tube is marked with your patient information. The technician will insert a thin needle into the vein, drawing blood out from the needle into a plastic hose that fills a test tube.They will clean the area of skin with an antiseptic wipe.A phlebotomy technician (expert in blood drawing) will locate a vein in your arm.The procedure is a simple blood test, which can take place in a doctor’s office. If you are just having an A/G test you will not have to fast. This doesn’t have anything to do with the A/G ratio component specifically but is relevant for other parts of the CMP. When done as part of a CMP, you’ll likely need to fast before the test, meaning you can’t eat or drink for a certain period of time leading up to your blood draw. A CMP is typically done at routine health checkups. The A/G ratio blood test is sometimes, but not always, done as part of a comprehensive metabolic panel (CMP). ![]()
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