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The level of oxygen in the blood can be measured by taking a blood sample from an artery, or, more easily, using a device called an oximeter, which is clipped to an earlobe.
Using an oximeter to keep track of the blood oxygen level, repeated artery punctures or heel sticks can be avoided.
The next step is to design a pulse oximeter in which this extra measuring facility is already an integral part.
An oximeter measures oxygen saturation, and some models also measure heart rate.
The child's blood oxygen level can be measured using a pulse oximeter, a sensor placed on the fingertip or earlobe.