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An arterial blood gas (ABG) is a blood test that is performed using blood from an artery.It involves puncturing an artery with a thin needle and syringe and drawing a small volume of blood.he blood can also be drawn from an arterial catheter. Pulse oximetry plus transcutaneous carbon dioxide measurement is an alternative method of obtaining similar information as well. An ABG is a test that measures the arterial oxygen tension (PaO 2), carbon dioxide tension (PaCO 2), and acidity (pH).
Human chorionic gonadotropin (hCG) is a hormone produced by the placenta during pregnancy, and an hCG blood test measures the level of this hormone in your bloodstream. There are two different types of hCG blood tests: 1  Qualitative (returning a yes/no answer about whether the woman has hCG in her blood) 2  Quantitative (returning a measurement of the precise amount of hCG in the blood)