Pulse Oximeters

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What do pulse oximeters do?
They measure the amount of oxygen carried by the haemoglobin in a patient's blood
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What do they contain?
It has a transmitter which emits two beams of red light and a photo detector to measure light
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How do they work?
The transmitter and photo detector are placed on either side of a thin part of the body (finger). The light passes through the tissue and on its way, some light is absorbed by the blood, reducing the amount of light detected.
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What does the absorption depend on?
The colour of the blood, as this depends on the bloods oxyhaemoglobin content.
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How much oxyhaemoglobin do healthy people have in their arteries?
They have at least 95% oxyhaemoglobin and no more than 5% reduced.
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What does reflection pulse oximetry do?
It reflects light off of red blood cells instead of shining a light through the body.
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Other cards in this set

Card 2

Front

What do they contain?

Back

It has a transmitter which emits two beams of red light and a photo detector to measure light

Card 3

Front

How do they work?

Back

Preview of the front of card 3

Card 4

Front

What does the absorption depend on?

Back

Preview of the front of card 4

Card 5

Front

How much oxyhaemoglobin do healthy people have in their arteries?

Back

Preview of the front of card 5
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