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.
to gather information about your heartâs rhythm â¢ Event Recorders â similar to a Holter monitor, but used to diagnose rhythm disturbances that occur at unpredictable times â¢ Echocardiogram â sound waves are used to produce a video image of your heart in motion â¢ Blood Testsâ can be used to see if you have thyroid problems or blood