Oxygen saturation is measured in what way?

Oxygen saturation is defined as the percentage of hemoglobin molecules in the blood that are saturated with oxygen. This measurement indicates how effectively oxygen is being transported throughout the body. It is expressed as a percentage, making "by percentage" the correct choice.

The concept behind this is that hemoglobin can bind to oxygen, and this binding capability is quantified as a ratio of the actual amount of oxygen bound to the total amount of hemoglobin present. For example, if 90% of the hemoglobin is oxygen-saturated, it reflects an adequate level of oxygen in the blood required for normal metabolic functions.

Understanding that oxygen saturation is a percentage is crucial for medical professionals, as it allows them to assess the respiratory status of patients and make informed decisions regarding potential interventions or treatments.