Pulse Oximetry

Pulse oximetry is a non-invasive physiological measurement technique that determines blood oxygen saturation percentage and heart rate by analyzing light absorption characteristics of oxygenated and deoxygenated hemoglobin in tissue. The technique provides rapid assessment of respiratory and cardiovascular function critical for detecting hypoxemia, respiratory distress, and cardiovascular compromise in emergency, surgical, and intensive care environments without requiring arterial blood sampling or laboratory processing delays.

The measurement relies on the principle that oxygenated hemoglobin and deoxygenated hemoglobin absorb red and infrared light at different rates. A pulse oximeter probe directs red light at 660 nanometers and infrared light at 940 nanometers through tissue toward a photodetector. The instrument calculates the absorption ratio at each wavelength to determine oxygen saturation percentage. Synchronization with the arterial pulse through time-varying light absorption changes allows simultaneous measurement of heart rate without separate pulse detection instrumentation.

Normal oxygen saturation ranges from 95 to 100 percent in healthy individuals breathing room air at sea level. Values below 90 percent indicate hypoxemia requiring intervention. Clinical significance of measured saturation depends on the patient’s clinical status, altitude, and whether they are breathing supplemental oxygen. Trends in oxygen saturation over time provide more diagnostic value than single point measurements, allowing detection of progressive respiratory deterioration requiring escalation of care.

In Pakistan, pulse oximetry supports military field hospitals providing initial patient assessment during triage, emergency medical services identifying respiratory distress victims at accident scenes, hospital operating rooms monitoring anesthetic complications, and disaster response medical teams rapidly assessing oxygenation status across large casualty populations.

Tactical Supply Pakistan supplies pulse oximetry equipment and education support for military medical, emergency response, and hospital applications across Pakistan.