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.
When you have follow-up appointments, your doctor can retrieve this information and use it to check how well your heart and the pacemaker are working. Most ordinary household electrical equipment is safe to use and won't interfere with your pacemaker. This includes microwaves, as long as they're in good working order.