A pulse oximeter is a medical device that measures heart rate and the oxygen level in the blood, expressed as the percent of oxygen saturation. Pulse oximeters operate by shining light through the skin to the blood vessels below. These devices are routinely used in many health care settings and are

An electrocardiogram (EKG or ECG) is a test that records the electrical activity of your heart. This test can help determine the cause of symptoms you might be having or check the overall health of your heart. Reading a basic EKG is not that hard. However, you should always let your doctor or medica