Oxygen saturation

Oxygen  saturation or dissolved oxygen (DO) is a relative measure of the amount of oxygen (as O2) which is dissolved in a given medium.

It can be measured with an oxygen sensor. The standard unit of oxygen saturation is percent (%).

Fish, invertebrates, plants, and aerobic bacteria all need oxygen (dissolved in water) for respiration.Ecology and classification of North American freshwater invertebrates: James H. Thorp; Alan P. Covich (eds) 2010.  Amsterdam; Boston: Academic Press, p32.  In medicine, oxygen saturation refers to oxygenation. This means when oxygen molecules () enter the tissues of the body. Normal arterial blood oxygen saturation levels in humans are 95–100 percent. If the level is below 90 percent, it is considered low and called hypoxemia.

 References 

Category:Physiology
Category:Oxygen
Category:Environmental chemistry