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Pulse oximeters measure how much of the hemoglobin in blood is carrying oxygen (oxygen saturation). If you work in healthcare (or have been patient !) you are very likely to have come across pulse oximeters. You can find them in areas such as operating rooms, recovery, critical care, wards, and ambulances.ulse oximeters measure how much of the hemoglobin in blood is carrying oxygen (oxygen saturation). If you work in healthcare (or have been patient !) you are very likely to have come across pulse oximeters. You can find them in areas such as operating rooms, recovery, critical care, wards, and ambulances.
Best Answer: it's very simple, they put a little device on your finger, it uses light to measure the oxygen content of your blood. As long as there are adequate levels of oxygen in your blood, there is adequate oxygen to your brain. The device is called a pulse oximeter. There is no one test to measure how much oxygen your brain is getting. Cerebral blood flow is measured by a few different tests, cerebral angiogram, MRA, ultrasound of carotids, etc. These are ordered by a neurologist.