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Point-of-care breath analyzers designed to determine the nitric oxide (NO) content in a breath sample, usually expressed as parts per billion (ppb, one part in 10^9 ). These analyzers typically use gas-measuring methods based on chemiluminescence and dedicated software; the typical range of measured values is up to 200 ppb. NO analyzers are intended for the periodic assessment of breath levels of NO to help determine disease (e.g., bronchial asthma) progression and treatment effectiveness.
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