Pastel refers to colors with high brightness and low saturation. Pulse oximetry is particularly convenient for noninvasive continuous measurement of blood oxygen saturation. Pulse oximetry will show a normal oxygen saturation. Pulse oximeters use them for measuring oxygen saturation. This increases color saturation and sharpness but reflections from lights and windows are very visible. Other helpful measurements include cardiac output and superior vena cava oxygen saturation. Both its saturation and brightness falling short of 100%, red-violet is not a pure chroma. And in areas with low oxygen saturation, both pigments were reduced. Pulse oximetry is a noninvasive method for monitoring a person's oxygen saturation. Descriptions in terms of hue/lightness/chroma or hue/lightness/saturation are often more relevant. Patients with poor oxygen saturation may need more blood. Oxygenation is commonly used to refer to medical oxygen saturation. The target oxygen saturation recommended depends on the condition being treated. These are selected for their magnetic properties, such as magnetic saturation, hysteresis and permeability. Gemstone color can be described in terms of hue, saturation, and tone.