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| Pulse oximetry relies on mild absorption by a tissue bed with pulsating blood. Therefore components that interfere with those parameters can interfere with the readings of pulse oximeters. Pulse oximeter readings could also be less accurate at colder temperatures. A temperature of roughly 33 degrees Celsius (91.4 degrees Fahrenheit) ought to be maintained for dependable readings. One generally implicated interfering issue is black or blue nail polish or synthetic fingernails, though some research investigating this matter have been inconclusive. If the sensor is positioned on a finger with black or blue nail polish or an artificial nail and doesn't give a reading, placing the sensor sideways on the finger mattress has been associated with some success. However, this can be outdoors that sensor's calibration. The oxygen saturation of patients with dark pores and skin tones could also be overestimated by approximately 2% and varies depending on the gadget used. This may occasionally lead to elevated charges of unrecognized hypoxemia. Intravenous dyes resembling methylene blue or indocyanine green, generally used for surgical or diagnostic procedures, will colour the serum in the blood and should interfere with the sunshine absorption spectrum, leading to falsely low readings. 
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