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 Blood
Gas Monitor
Blood gas monitors are medical instrumentation, which measures the
amount of a dissolved gas in the patient's blood. Blood gas monitors are
attached to medical monitor allowing staff to directly read a patient's
oxygenation continuously.
The most common monitors measure oxygen perfusion, which has a small
light-emitting
diode and photodiode. The diode and photodiode are located on a probe
that is clipped to a part of the patient's body, usually a fingertip or
earlobe. Oxygen rich blood reflexes red light. When the patient's
oxygenation level drops, the blood becomes bluer, and less red light is
reflected to the photodiode. Instrumentation that measures pO2 (oxygen)
and pCO2 (carbon dioxide) as well as the pH values of the blood is also
available and used.
A blood-oxygen monitor normally measures percent of normal, with 95 to
100 percent being the normal range. The monitor values bounces because
of the heartbeat, causing the blood vessels to expand and contract.
Before the invention of the Oxymeter, and Saturometer complicated blood
tests were performed to calculate a patients pO2 and pCO2.
Blood oxygen monitors are critical in the treatment of patients with
respiratory or cardiac problems.
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