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.
A normal blood oxygen level should be 94% to 98% . However, as a result of not breathing for 30 seconds or more during sleep, your sleep apnea oxygen level would drop to 80% or less. Keep in mind that anything below 90% oxygen level is dangerous to your body and require intervention.