Some forums threads suggest another solution to fix the gray out iPhone 4S Wifi issue: placing the iPhone 4S in a refrigerator or freezer for several minutes, for they considered the 4S WiFi issue after iOS 7 update is caused by the heating issues.
An ABG test uses blood drawn from an artery, where the oxygen and carbon dioxide levels can be measured before they enter body tissues. Partial pressure of oxygen (PaO2). This measures the pressure of oxygen dissolved in the blood and how well oxygen is able to move from the airspace of the lungs into the blood.
Blood gas analysis, also called arterial blood gas (ABG) analysis, is a test which measures the amounts of oxygen and carbon dioxide in the blood, as well as the acidity (pH) of the blood.lood gas analysis, transcutaneous the determination of P O 2 and P CO 2 by placement of a heated electrode over the skin to get an inference of Pa O 2 and Pa CO 2. blood group the phenotype of erythrocytes defined by one or more cellular antigenic structural groupings under the control of allelic genes.