Dr Sarah Belsey PhD

Principle Clinical Scientist

Sarah joined the department in 2009 and is currently the Principal Clinical Scientist within Toxicology at King’s College Hospital. She oversees both routine analysis and research within the therapeutic drug monitoring and drugs of abuse sections. She completed her PhD in 2018 which focused on the application of high-resolution mass spectrometry for detection of drugs of abuse. Her research to date has been focused on analysis of drugs of abuse, but has also included aspects of therapeutic drug monitoring, forensic toxicology and trace metal analysis. 


Belsey SL and Karch SB (2020) Chemical Crowd Control Agents, In Clinical Forensic Medicine: A Physician’s Guide (Fourth Edition), edited by Margaret M Stark, Springer, Pages 239-253, ISBN 9783030294618.
Handley SA, Belsey SL, Couchman L, Flanagan RJ. Plasma and Urine Levamisole in Clinical Samples Containing Benzoylecgonine: Absence of Aminorex. J Anal Toxicol. 2019; 43:299-306.


Belsey SL, Ireland R, Lang K, Kizilors A, Ho A, Mufti GJ, Bisquera A, De Lavallade H, Flanagan RJ. Women Administered Standard Dose Imatinib for Chronic Myeloid Leukemia Have Higher Dose-Adjusted Plasma Imatinib and Norimatinib Concentrations Than Men. Ther Drug Monit. 2017; 39:499-504.


Postmortem biochemistry: Current applications. Belsey SL, Flanagan RJ. J Forensic Leg Med. 2016; 41:49-57.


Couchman L, Subramaniam K, Fisher DS, Belsey SL, Handley SA, Flanagan RJ. Automated analysis of clozapine and norclozapine in human plasma using novel extraction plate technology and flow-injection tandem mass spectrometry. Ther Drug Monit 2016; 38:42-49.


Belsey SL and Karch SB (2015) Substance Misuse: Herbal Medicine, In Encyclopedia of Forensic and Legal Medicine (Second Edition), edited by Jason Payne-James and Roger W. Byard, Elsevier, Oxford, Pages 377-387, ISBN 9780128000557.
Genetic differences in cytochrome P450 enzymes and antidepressant treatment response. Hodgson K, Tansey K, Dernovsek MZ, Hauser J, Henigsberg N, Maier W, Mors O, Placentino A, Rietschel M, Souery D, Smith R, Craig IW, Farmer AE, Aitchison KJ, Belsey S, Davis OS, Uher R, McGuffin P. J Psychopharmacol. 2014; 28:133-41.


Belsey SL, Couchman L and Flanagan RJ (2014) Buprenorphine detection in urine using liquid chromatography-high-resolution mass spectrometry: comparison with cloned enzyme donor immunoassay and homogeneous enzyme immunoassay. J Anal Tox 38: 438-443.
Flanagan RJ, Belsey SL, Launiainen T. (2014). Chapter 44: Forensic Biochemistry. In: Marshall W, et al. Clinical Biochemistry: Metabolic and clinical aspects 3rd Edition. Elsevier
Couchman L, Belsey SL, Handley SA, Flanagan RJ. A novel approach to quantitative LC-MS/MS: therapeutic drug monitoring of clozapine and norclozapine using isotopic internal calibration. Anal Bioanal Chem 2013; 405:9455-9466
Tyrosine kinase inhibitors impair B-cell immune responses in CML through off-target inhibition of kinases important for cell signaling. de Lavallade H, Khoder A, Hart M, Sarvaria A, Sekine T, Alsuliman A, Mielke S, Bazeos A, Stringaris K, Ali S, Milojkovic D, Foroni L, Chaidos A, Cooper N, Gabriel I, Apperley J, Belsey S, Flanagan RJ, Goldman J, Shpall EJ, Kelleher P, Marin D, Rezvani K. Blood. 2013; 122:227-238.

Contact information

020 3299 5883

Last updated: 07/12/2020