1. Saito J, Gibeon D, Macedo P, Menzies-Gow A, Bhavsar P, Chung K. Domiciliary diurnal variation of exhaled nitric oxide fraction for asthma control. 2017.
2. ATS/ERS Recommendations for Standardized Procedures for the Online and Offline Measurement of Exhaled Lower Respiratory Nitric Oxide and Nasal Nitric Oxide, 2005; American Journal of Respiratory and Critical Care Medicine; vol. 171: 912-930;2005
3. Shelhamer JH, Levine SJ, Wu T, Jacoby DB, Kaliner MA, Rennard SI. NIH conference: airway inflammation. Ann Intern Med 1995;123:288-304.
4. Correlation of Exhaled Nitric Oxide, Spirometry and Asthma Symptoms: Journal of Asthma: Vol 42, No 10 [Internet]. Tandfonline.com. 2017 [cited 15 March 2017]. Available from: http://www.tandfonline.com/doi/abs/10.1080/02770900500371344
5. Andrew D. Smith, Jan O. Cowan, Sue Filsell, Chris MacLachlan, Gabrielle Monti Sheehan, Pamela Jackson and D. Robin Taylor. Diagnosing Asthma: Comparisons between Exhaled Nitric Oxide Measurements and Conventional Tests. Am J Respir Crit Care Med Vol 169. pp 473-478, 2004.
6. D R Taylor, MW Pinenburg, A D Smith and J C D Jongste. Exhaled nitric oxide measurements: clinical application and interpretation. Thorax 2006;61:817-827.
7. Coumou HBel E. Improving the diagnosis of eosinophilic asthma [Internet]. Taylor and Francis online. 2017 [cited 15 March 2017]. Available from: http://www.tandfonline.com/doi/full/10.1080/17476348.2017.1236688
8. Asthma facts and statistics | Asthma UK [Internet]. Asthma UK. 2019 [cited 2 December 2019]. Available from: https://www.asthma.org.uk/about/media/facts-and-statistics/
9. Kudo M, Ishigatsubo Y, Aoki I. Pathology of asthma. Frontiers in Microbiology. 2013;.
19. PIZZICHINI E, PIZZICHINI M, EFTHIMIADIS A, DOLOVICH J, HARGREAVE F. Measuring airway inflammation in asthma: Eosinophils and eosinophilic cationic protein in induced sputum compared with peripheral blood. Journal of Allergy and Clinical Immunology. 1997;99(4):539-544.
11. Keller A, Rodriguez D, Russo M. Nitric oxide paradox in asthma. Memórias do Instituto Oswaldo Cruz. 2005;100(suppl 1):19-23.
13. Ricciardolo F, Sorbello V, Ciprandi G. FeNO as biomarker for asthma phenotyping and management. Allergy and Asthma Proceedings. 2015;36(1):88-88.
14. Public Health England. An Evaluation of Filtration Efficiencies Against Bacterial and Viral Aerosol Challenges. Salisbury: Public Health England; 2020
15. J. Saito et al, European Respiratory Journal; Domiciliary diurnal variation of fractional exhaled nitric oxide for asthma control. August 15 2013, v.43, iss.4, pp 474-484.
16. What is a FeNO Test? [Internet]. Aaaai.org. 2021. Available from: https://www.aaaai.org/Tools-for-the-Public/Conditions-Library/Asthma/What-Is-A-FeNO-Test
17. Gillissen A, Paparoupa M. Inflammation and infections in asthma. The Clinical Respiratory Journal [Internet]. 2014 May 15;9(3):257–69.
18. Asthma + Lung UK. What Is Asthma? [Internet]. Asthma + Lung UK. 2024. Available from: https://www.asthmaandlung.org.uk/conditions/asthma/what-asthma
19. Asthma + Lung UK. What is asthma? [Internet]. Asthma + Lung UK; 2024. Available from: https://www.asthmaandlung.org.uk/conditions/asthma/what-asthma
20. Jacobs A, Wu R, Tomini F, De Simoni A, Mihaylova B. Strong and graded associations between level of asthma severity and all-cause hospital care use and costs in the UK. BMJ Open Respiratory Research [Internet]. 2023;10(1):e002003. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10729223/
21. World Health Organization. Asthma [Internet]. World Health Organization; 2024. Available from: https://www.who.int/news-room/fact-sheets/detail/asthma
22. Pizzichini E, Pizzichini MM, Efthimiadis A, Dolovich J, Hargreave FE. Measuring airway inflammation in asthma: eosinophils and eosinophilic cationic protein in induced sputum compared with peripheral blood. The Journal of Allergy and Clinical Immunology [Internet]. 1997;99(4):539–544. Available from: https://pubmed.ncbi.nlm.nih.gov/9111500/
23. National Institute for Health and Care Excellence. Asthma: diagnosis, monitoring and chronic asthma management (BTS, NICE, SIGN) [Internet]. NICE; 2024. Available from: https://www.nice.org.uk/guidance/NG245
24. Asthma + Lung UK. FeNO test [Internet]. Asthma + Lung UK. 2026. Available from: https://www.asthmaandlung.org.uk/symptoms-tests-treatments/tests/feno-test
25. National Institute for Health and Care Excellence. Overview | Asthma: diagnosis, monitoring and chronic asthma management (BTS, NICE, SIGN) | Guidance | NICE [Internet]. Nice.org.uk. NICE; 2024. Available from: https://www.nice.org.uk/guidance/NG245
26. Smith, A.D., Cowan, J.O., Filsell, S., McLachlan, C., Monti-Sheehan, G., Jackson, P. and Taylor, D.R., 2004. Diagnosing asthma: comparisons between exhaled nitric oxide measurements and conventional tests. American journal of respiratory and critical care medicine, 169(4), pp.473-478.