🫁 Polish on the fingernails — CORRECT
🫁 Nail polish, particularly darker colors, can interfere with the transmission and absorption of light used by the pulse oximeter.
🫁 A pulse oximeter estimates oxygen saturation by passing specific wavelengths of light through the tissue.
🫁 Nail polish can alter the amount of light reaching the sensor and potentially produce an inaccurate reading.
🫁 The nurse should inspect the client's nail before accepting an unexpectedly low oxygen saturation value.
🫁 Removing the polish may improve the reliability of the measurement.
🫁 The probe can also be repositioned to another suitable site when nail polish cannot be removed.
🫁 An unexpectedly low SpO₂ should always be interpreted together with the client's respiratory assessment and clinical appearance.
🫁 Nail polish therefore gives the nurse a reason to question the accuracy of the 88% reading.
🫁 Bruising on the hand — CORRECT
🫁 Bruising can interfere with light transmission through the tissue and affect pulse oximeter measurements.
🫁 A bruise contains blood that has leaked into surrounding tissues, potentially altering light absorption.
🫁 The nurse should avoid placing the pulse oximeter over tissue that is bruised, injured, or compromised when possible.
🫁 Local tissue changes can make it more difficult for the sensor to distinguish arterial pulsations accurately.
🫁 The nurse should inspect the finger and surrounding hand when evaluating an unexpected SpO₂ measurement.
🫁 Selecting an unaffected finger or alternative site can help determine whether the original value was accurate.
🫁 Rechecking the saturation at another appropriate site provides additional information before concluding that the client has true hypoxemia.
🫁 The presence of bruising therefore provides a reasonable basis for questioning the accuracy of the pulse oximeter reading.
🫁 Weak, thready radial pulse — CORRECT
🫁 A weak, thready pulse suggests decreased peripheral perfusion, which can significantly affect pulse oximetry accuracy.
🫁 Pulse oximeters require adequate pulsatile arterial blood flow to distinguish arterial blood from surrounding tissues.
🫁 Poor peripheral circulation decreases the strength of the signal detected by the sensor.
🫁 Conditions such as hypotension, shock, vasoconstriction, hypothermia, and reduced cardiac output can similarly produce unreliable measurements.
🫁 A weak radial pulse indicates that blood flow to the finger may be insufficient for a dependable reading.
🫁 The nurse should compare the displayed pulse rate with the client's actual pulse and evaluate the device's signal quality when available.
🫁 Repositioning the probe or using a better-perfused site may produce a more reliable oxygen saturation measurement.
🫁 Poor peripheral perfusion therefore makes the reported 88% SpO₂ potentially inaccurate and warrants reassessment.