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Applied Optics

Applied Optics


  • Vol. 41, Iss. 28 — Oct. 1, 2002
  • pp: 6018–6029

Nitric oxide breath testing by tunable-diode laser absorption spectroscopy: application in monitoring respiratory inflammation

Chad Roller, Khosrow Namjou, James D. Jeffers, Mark Camp, Adam Mock, Patrick J. McCann, and Joe Grego  »View Author Affiliations

Applied Optics, Vol. 41, Issue 28, pp. 6018-6029 (2002)

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We used a high-resolution mid-IR tunable-laser absorption spectroscopy (TLAS) system with a single IV–VI laser operating near 5.2 µm to measure the level of exhaled nitric oxide (eNO) in human breath. A method of internal calibration using simultaneous eNO and exhaled CO2 measurements eliminated the need for system calibration with gas standards. The results observed from internally calibrating the instrument for eNO measurements were compared with measurements of eNO calibrated to gas standards and were found to be similar. Various parameters of the TLAS system for eNO breath testing were examined and include gas cell pressure, exhalation time, and ambient NO concentrations. A reduction in eNO from elevated concentrations (∼44 parts in 109) to near-normal levels (<20 parts in 109) from an asthmatic patient was observed after the patient had received treatment with an inhaled glucocorticoid anti-inflammatory medication. Such measurements can help in evaluating airway inflammation and in monitoring the effectiveness of anti-inflammatory therapies.

© 2002 Optical Society of America

OCIS Codes
(000.1430) General : Biology and medicine
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(300.1030) Spectroscopy : Absorption
(300.6340) Spectroscopy : Spectroscopy, infrared

Original Manuscript: March 21, 2002
Revised Manuscript: June 20, 2002
Published: October 1, 2002

Chad Roller, Khosrow Namjou, James D. Jeffers, Mark Camp, Adam Mock, Patrick J. McCann, and Joe Grego, "Nitric oxide breath testing by tunable-diode laser absorption spectroscopy: application in monitoring respiratory inflammation," Appl. Opt. 41, 6018-6029 (2002)

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