Welch Allyn 420 Series Operator's Manual page 12

SpO Cautions
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• The pulse oximeter is calibrated to determine the percentage of arterial oxygen saturation of
functional hemoglobin. Significant levels of dysfunctional hemoglobin such as
carboyhemoglobin or methmoglobin may affect the accuracy of the measurement.
• Some intravascular dyes, depending on the concentration, may affect the accuracy of the SpO
measurement.
• Some sensors may not be appropriate for a particular patient. If at least 10 seconds of perfusion
pulses cannot be observed for a given sensor, change sensor location or sensor type for
perfusion to resume.
Temperature Cautions
• Normal mode (10 second) axillary temperatures are FDA approved only for children under the age
of four. Normal mode axillary temperatures may not be accurate on older children or adults.
THE WELCH ALLYN SPOT VITAL SIGNS IS NOT INTENDED TO BE USED ON NEONATAL
PATIENTS.
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