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. In medicine, oxygen saturation refers to oxygenation. This means when oxygen molecules (O
2) 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[change | change source]
- Ecology and classification of North American freshwater invertebrates: James H. Thorp; Alan P. Covich (eds) 2010. Amsterdam; Boston: Academic Press, p32.
- "Hypoxemia (low blood oxygen)". Mayo Clinic. mayoclinic.com. Retrieved 6 June 2013.