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.
For a regular healthy person, the normal blood oxygen saturation level (SpO2) should be around 94% to 99%. For patients with mild respiratory diseases, the SpO2 should be 90% or above. Supplementary oxygen should be used if SpO2 level falls below 90%, which is unacceptable for a prolonged period of time.