Pulse oximetry is a noninvasive medical procedure used to measure a person's oxygen saturation level. Waves of infrared light determine the amount of oxygen the blood's hemoglobin is carrying. Hemoglobin is a component in blood that carries oxygen to cells throughout the body. The arterial oxygen saturation is measured using the symbols SPO2. Oxygen levels can be monitored continuously or intermittently. Pulse oximetry can detect critical changes in oxygen levels before other signs and symptoms.
Step 1
Select a finger for the test; the index finger is commonly used but any finger will work. Remove all nail polish or varnish from the fingernail, as well as artificial nails.
Step 2
Clip the probe onto the finger, over the nail bed. Attach the probe similar to a clothes pin. Ensure there is no pain associated and the probe comfortably fits over the finger. Choose a different finger if the probe does not comfortably fit.
Step 3
Turn the machine on. Allow the machine to adjust and configure. Read how strong the pulse signal is, if the machine monitors signal strength. Change fingers if the current finger is indicating a poor signal--often a sign of a weak pulse, poor circulation or simply cold hands. Look at the monitor to see what the percentage of blood is saturated with oxygen. Read the saturation level in terms of percentage; normal ranges are between 95 and 99 percent. Remember levels may differ greatly depending on overall health.
Step 4
Clean the pulse oximetry equipment using universal precautions when using the equipment for more than one patient. Wipe with alcohol or disinfectant solution. Remember to clean the machine and probe if used for prolonged periods, recommends The American Association for Respiratory Care.
Things You'll Need
- Pulse oximetry machine
- Alcohol swabs
- Nail polish remover
References
- Lippincott's Nursing Procedures; Lippincott Williams & Wilkins; 2008
- Nursing Assistant: A Nursing Process Approach;Barbara R. Hegner, Barbara Acello, Esther Caldwell; 2003
- Pulse Ox Info
