NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Lab Tests Online Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used.

We have included the web address to online sources used in developing and reviewing this article for documentation purposes only. Links included on this Sources page were valid, working links at the time this article was originally prepared, and at each update as indicated here. Please be aware that the source owner may, from time to time, reorganize the source web site, which can result in broken links on our pages. If you wish to access a source and come across a broken link, you may still be able to access it by entering just the parent web address in your browser's address bar (e.g., "www.nih.gov") and then by entering the source title in the site's search feature.

S1
Pagana, Kathleen D. & Pagana, Timothy J. (© 2007). Mosby’s Diagnostic and Laboratory Test Reference 8th Edition: Mosby, Inc., Saint Louis, MO. Pp 790-795.

S2
Clarke, W. and Dufour, D. R., Editors (2006). Contemporary Practice in Clinical Chemistry, AACC Press, Washington, DC. Pp 462.

S3
Wu, A. (2006). Tietz Clinical Guide to Laboratory Tests, Fourth Edition. Saunders Elsevier, St. Louis, Missouri. 1490-1491.

S4
(2007 August 28). Expert Panel Report 3: Guidelines for the Diagnosis and Management of Asthma [440 pages]. National Heart, Lung, and Blood Institute, National Asthma Education and Prevention Program [On-line guidelines]. Accessed on: 11/17/07. Available FTP: http://www.nhlbi.nih.gov/guidelines/asthma/asthgdln.htm

S5
Busse, W. et. al. (2007 October 29). Guidelines for the Diagnosis and Management of Asthma -- Part 2 - Managing Asthma Long Term [59 paragraphs]. Medscape Today [On-line CME]. Accessed on: 11/15/07. Available FTP: http://www.medscape.com/viewarticle/564654

S6
Busse, W. et. al. (2007 October 29). Guidelines for the Diagnosis and Management of Asthma -- Part 1: Introduction -- Diagnosing Asthma [41 paragraphs]. Medscape Today [On-line CME]. Accessed on: 11/15/07. Available FTP: http://www.medscape.com/viewarticle/564695

S7
News Staff (2007 October 11). New Asthma Guidelines Emphasize Need for Regular Monitoring, Disease Control [8 paragraphs]. AAFP News Now [On-line information]. Accessed on: 11/15/07. Available online

S8
Frey, U. (2007 July 17). Predicting Asthma Control and Exacerbations: Chronic Asthma as a Complex Dynamic Model [28 paragraphs]. Medscape from Curr Opin Allergy Clin Immunol. 2007;7(3):223-230 [On-line journal article]. Accessed on: 11/15/07. Available FTP: http://www.medscape.com/viewarticle/559407

S9
Fleming, L. et. al. (2007 April 3). Difficult to Control Asthma in Children [32 paragraphs]. Medscape from Curr Opin Allergy Clin Immunol. 2007;7(2):190-195 [On-line information]. Accessed on: 11/15/07. Available FTP: http://www.medscape.com/viewarticle/554049

S10
Boulet, L. et. al. (2007 February 27). New Insights Into Occupational Asthma [26 paragraphs]. Medscape from Curr Opin Allergy Clin Immunol. 2007;7(1):96-101. [On-line information]. Accessed on: 11/15/07. Available FTP: http://www.medscape.com/viewarticle/552280

S11
Mckenzie, S. and Dundas, I. (2006 April 19). Spirometry in the diagnosis of asthma in children CME [27 paragraphs]. Medscape from Curr Opin Pulm Med 12(1):28-33, 2006 [On-line CME]. Accessed on: 11/15/07. Available FTP: http://www.medscape.com/viewarticle/529087

S12
(2006 May, Updated). What is Asthma [91 paragraphs]. National Heart Lung and Blood Institute [On-line information]. Accessed on: 11/15/07. Available FTP: http://www.nhlbi.nih.gov/health/dci/Diseases/Asthma/Asthma_WhatIs.html

S13
Schatz, M. (2007 June). Asthma vs. COPD: Similarities and Differences [8 paragraphs]. American Academy of Allergy Asthma and Immunology, Seniors and Asthma [On-line information]. Accessed on: 11/15/07. Available FTP: http://www.aaaai.org/patients/seniorsandasthma/copd.stm

S14
(2006 June 1). Asthma [73 paragraphs]. MayoClinic.com [On-line information]. Accessed on: 11/15/07. Available FTP: http://www.mayoclinic.com/health/asthma/DS00021/UPDATEAPP=0

S15
(2003 February, full review/revision). Asthma [51 paragraphs]. Merck Manual of Medical Information – 2nd Home Edition [On-line information]. Accessed on: 11/15/07. Available FTP: http://www.merck.com/mmhe/sec04/ch044/ch044a.html?qt=Asthma&alt=sh

S16
(2005 November, full review/revision). Asthma [67 paragraphs]. Merck Manual for Health Professionals [On-line information]. Accessed on: 11/15/07. Available FTP: http://www.merck.com/mmpe/sec05/ch048/ch048a.html?qt=asthma&alt=sh

S17
Zeidler, M. et. al. (2004 January 13). Exhaled Nitric Oxide in the Assessment of Asthma [23 paragraphs]. Medscape from Curr Opin Pulm Med 10(1):31-36, 2004. [On-line information]. Accessed on: 11/17/07. Available FTP: http://www.medscape.com/viewarticle/466828_1

S18
Thomas, Clayton L., Editor (1997). Taber’s Cyclopedic Medical Dictionary. F.A. Davis Company, Philadelphia, PA [18th Edition]. pp 164-165.

S19
American Academy of Allergy Asthma and Immunology (April 6, 2004). Exhaled Nitric Oxide in the Diagnosis of Asthma (online article, accessed January 2008). Available online

S20
US Food and Drug Administration. FDA Talk Paper (May 1, 2003) FDA Clears New Breath Test for Monitoring Asthma (online information, accessed February 2008). Available FTP: http://www.fda.gov/bbs/topics/ANSWERS/2003/ANS01219.html