The RT draws an ABG sample from a conscious and alert patient in a postsurgical unit who also is…

The RT draws an ABG sample from a conscious and alert
patient in a postsurgical unit who also is being monitored with a pulse
oximeter, which reads 80% saturation. The patient is breathing 35% O2 through
an air-entrainment mask. The patient’s extremities are pink and warm. After
running the blood sample through a calibrated ABG analyzer with a hemoximeter,
the RT obtains the following values:

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PaO2 = 90 mm Hg

Hb = 12 g/dl

SaO2 = 98%

metHb = 0.5%

HbCO = 1%

Explain the difference between the pulse oximeter and
hemoximeter readings of this patient’s blood O2 levels and what action the RT
should take.

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