Final answer:
A CPCT may face issues getting a pulse oximeter reading due to improper finger placement, poor blood flow, probe malfunction, external interference, or technical problems. The device reads percent saturation to alert for conditions such as hypoxemia.
Step-by-step explanation:
When a Certified Patient Care Technician (CPCT) is unable to get a reading on a pulse oximeter, several issues could be the cause. The patient’s finger may not be properly inserted into the device, or there could be problems such as poor peripheral blood flow, which is often seen in cold extremities or in patients in shock. It's also possible that the probe is malfunctioning or incompatible with the monitor, or that there is external interference affecting the sensor, such as ambient light or nail polish.
The pulse oximeter operates by transmitting red and infrared light through the patient’s finger and measuring differences in light absorption by oxygenated and deoxygenated hemoglobin, expressed as percent saturation. A common reading is from 95-100 percent. Values below this range may indicate hypoxemia, requiring further clinical investigation. Lastly, technical issues such as low battery power or incorrect device settings could prevent a proper reading.