Arterial Blood Gases. Test Overview. An arterial blood gas (ABG) test measures the acidity (pH) and the levels of oxygen and carbon dioxide in the blood from an artery. This test is used to check how well your lungs are able to move oxygen into the blood and remove carbon dioxide from the blood.
How Often the Test Is Done During Your Pregnancy. Your doctor may use the Doppler often to listen to your baby's heartbeat during routine checkups, starting at about 8 to 10 weeks. Handheld Dopplers will not work quite this early.
â¢ Tell your other doctors and your dentist that you have. a pacemaker. Certain types of medical equipment may. affect how a pacemaker works. â¢ Tell airport security that you have a pacemaker. A pacemaker is a small device that helps your. heart beat more regularly. It does this with a. small electric stimulation that helps control your. heartbeat. Your doctor puts the pacemaker under. the skin on your chest, just under your collarbone. Itâs hooked up to your heart with tiny wires.