![]() ![]() Due to the complexity of arterial blood gas sampling, it is often reserved for critically ill canine patients, leaving pulse oximetry the common bedside test for evaluating oxygenation. That said, in VetGirl’s opinion: pulse oximeter + venous blood gas (VBG) = ABG. So, how exactly does the pulse oximeter work? The pulse oximeter calculates the percent of oxygen saturation of hemoglobin in arterial blood using spectrophotometry. The probe passes light through the tissues at two different wavelengths: a red and infrared light absorption. Oxygenated hemoglobin absorbs more infrared light and allows more red light to pass through. Deoxygenated (or reduced) hemoglobin absorbs more red light and allows more infrared light to pass through. The difference in light absorption is calculated and the final figure is displayed as a percentage (SpO2%). Bear with us and think back to third-year veterinary school… So, why should you care? Because with the non-invasive pulse oximeter, you can correlate your SpO2% to the partial pressure of oxygen in the blood (PaO2) based off the oxyhemoglobin dissociation curve. Call us today.The oxyhemoglobin dissociation curve (OHDC) relates oxygen saturation (SpO2) and partial pressure of oxygen in the blood (PaO2). Our team is always available to answer any questions you may have about our products. We offer a wide selection of pulse oximeters, as well as other medical devices and supplies. If you're looking for a pulse oximeter, be sure to check out the Santamedical website. If you have any questions about your pulse oximetry readings, be sure to ask your doctor or nurse for more information. By understanding your readings, you can be proactive in ensuring that your oxygen level stays within a healthy range. ![]() If you have any questions about your readings, be sure to ask your doctor or nurse.Ī pulse oximeter reading chart can help you understand your oxygen saturation levels and what they mean for your health. Pulse oximetry is a simple, painless test that can give you important information about your oxygen level. A reading of 80% or below indicates that you are in danger of respiratory failure and require immediate medical attention. However, a reading of 90% means that your oxygen level is low and you may need supplemental oxygen. For example, a reading of 97% means that your oxygen level is normal. The chart will list different saturation levels and what they mean in terms of your oxygen level. Pulse oximeter readings chartĪ pulse oximeter reading chart can help you understand what your readings mean. The amount of light absorbed by the tissue is proportional to the amount of oxygenated hemoglobin in the blood therefore, by measuring the absorption of light at different wavelengths, an estimate of arterial oxygen saturation can be made. The light waves are passed through the tissue and detected by a photodetector on the other side. ![]() The "pulse" component of pulse oximetry refers to the pulsing nature of arterial blood flow. The name "pulse oximeter" derives from its use to measure oxygen saturation by measuring the changes in pulsation amplitude (related to the strength of arterial blood flow) during each heartbeat.Īn oximeter works by shining light through a portion of the body, typically a finger, earlobe or nostril, that is perfused with arterial blood. A pulse oximeter is a medical device that indirectly measures the oxygen saturation of arterial blood. ![]()
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