Value, in terms of art, is the darkness or lightness of a color. Value is one of the seven elements of art and in many circles, it is considered to be the most important. Its importance in creating the illusion of light, form, and texture in a drawing or painting cannot be denied.
However, oxygen levels can vary greatly and have a large impact on how a person is able to function. As a consequence, medical professionals have developed standards for the amount of oxygen that should be present within a personâs body. For most people, an oxygen level of 95 percent to 100 percent is considered normal.
Oximeters are commonly used these days in hospitals and by critical-care professionals to define blood oxygen levels and diagnose hypoxemia. On an average, the normal oxygen levels in our blood stream are about 85 mm Hg. In people suffering from hypoxemia, this falls down to as low as 60 mmHg. During hypoxemia, the oxygen saturation in the body is less than 90 percent. This is the formal definition of hypoxemia. Normal pulse oximeter readings can range from 95 to 100 percent.