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.
Palpitations.: We need to know what your heart is doing during these episodes of palpitations, and the best way to know would be to wear a Holter monitor, which records your heart rhythm for a day or two. We can catch episodes this way and see what your heart is doing, and by that infer etiology. Mention this to your doctor. ...Read more.