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A respirometer is a device which is used to measure respiration, where organisms exchange carbon dioxide and oxygen as part of their metabolism.
Pulse volume recording (PVR) is a non-invasive imaging test that evaluates the lower or upper extremity blood flow. They are actually the more complete form of ankle brachial index, because they test more areas of the limb and not just the flow at the end. Pulse volume recording is a functional test. This means that it does not examine specific blood vessels, but rather assesses the sum of all blood flow to the examined limb.