Blood oxygen levels refer to the amount of oxygen circulating in the blood. Normal blood oxygen levels fall between 75 and 100 millimeters of mercury (mm Hg) on arterial blood gas (ABG) test results.

Tiger Iron formed when in the sea dissolved iron reacted with free oxygen produced by the first photosynthetic life forms on Earth. For the first 2 billion years of Earth's history, there was barely ...

Scientists rethink why giant insects once ruled the skies, finding oxygen may not explain their size or disappearance.

Patients continuously monitored after surgery experienced significantly less time with dangerously low oxygen levels compared ...

Reducing oxygen levels in critically ill children on mechanical ventilators in intensive care could save tens of young lives each year, finds a new study led by researchers at UCL and Great Ormond ...

Last summer, in an unseasonal event, more than 100 miles of Florida’s coast around Tampa Bay became an oxygen-depleted dead zone littered with fish along the nearby shoreline. In the Northwest, ...

Get your news from a source that’s not owned and controlled by oligarchs. Sign up for the free Mother Jones Daily. Off the coast of southeastern China, one particular fish species is booming: the ...