A pulse oximeter is a commonly used tool in respiratory therapy. This device helps to determine the amount of oxygen saturation of arterial blood. This tool is only used to aid in your assessment. It is the nurse's job to evaluate the reading, along with other findings, to determine the need for interventions. An oximetry reading should never be the sole determining factor used to initiate an intervention. When using pulse oximetry as a tool in your assessment, take the time to review the client's history and consider other factors that might affect the reading. The physician might order a frequency or parameters for checking a client's oxygen saturation. It is also an intervention that can be used based on nursing judgment.
The accuracy of the pulse oximeter reading can be altered by several factors. Use the right sensor and size for the site selected. Several types of sensors designed depending on specific body areas. The accuracy of the reading also can be affected by alterations in circulation, movement by the client, and substances such as nail polish. Always remember to check your facility's policy regarding this procedure.