What is considered an inaccurate pulse oximetry value?

A pulse oximetry value of 70% is considered inaccurate and typically indicates a very low level of oxygen saturation in the blood. Normal oxygen saturation levels for healthy individuals usually range from 95% to 100%. Values below 90% are concerning and may indicate hypoxemia, which is a medical emergency requiring immediate assessment and intervention.

In clinical practice, values below 80% might not reflect true arterial saturation accurately due to potential errors associated with low readings. Factors such as poor peripheral circulation, nail polish, and movement can also contribute to inaccurate readings. A value of 70% generally suggests an inability of the oximeter to detect adequate hemoglobin saturation, making it likely inaccurate.

While values such as 85%, 95%, and 100% can be plausible readings within certain clinical contexts, a value of 70% stands out as exceptionally low, raising red flags about its accuracy and the patient's respiratory status.