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Purine Research Laboratory at St Thomas' Hospital

Laboratory overview

Opening hours: Monday to Friday, 9am - 5:30pm
 

We are a UKAS accredited medical laboratory (No.9093), accredited to ISO15189:2022 for the tests listed in the schedule of accreditation available on the UKAS website (https://www.ukas.com/wp-content/uploads/schedule_uploads/00007/9093-Medical-Single.pdf). Any tests not currently accredited, are noted as such in the test details on this website. Tests for the detection of biochemical analytes using mass spectrometry technologies are include in the laboratory's UKAS flexible scope accredited to ISO15189:2022, as described in the 'Management of UKAS Flexible Scope' document (see below). All tests currently included within that flexible scope are listed in the 'Record of tests included in Flexible Scope' document (also below). 

Our laboratory has been providing specialised diagnostic services for purine and pyrimidine disorders to the NHS since the early 1970s.

Research into these areas, as well as into pharmacogenetics and therapeutic drug monitoring, continues to be translated into the diagnostic service and clinical practice.

Key features:

Vertical T

We provide a comprehensive diagnostic service for:

  • Inherited disorders of purine and pyrimidine metabolism (metabolite screens on urine and plasma, enzyme assays and genetic testing).
  • Pharmacogenetics and therapeutic drug monitoring to personalise the therapy of drugs targeting purine and pyrimidine metabolic pathways (thiopurines, fluoropyrimidines and low dose methotrexate).
Management of UKAS Flexible Scope
PDF (765Kb)
Record of tests included in Flexible Scope
PDF (180Kb)
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Last updated on 14/11/2025
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view our tests
Tuesday, 30 August, 2016
A practical guide to thiopurine prescribing and monitoring in IBD
Ben Warner , Emma Johnston , Monica Arenas-Hernandez , , Peter Irving , Jeremy Sanderson
Friday, 19 December, 2014
A practical guide to the use of thiopurines in oral medicine.
Hullah EA , Blaker PA , , Escudier MP , Sanderson JD
Friday, 14 June, 2013
The Mechanism of Allopurinol Induced TPMT Inhibition
Up to 1/5 of patients with wildtype thiopurine-S-methyltransferase (TPMT) activity prescribed azathioprine (AZA) or mercaptopurine (MP) demonstrate a skewed drug metabolism in which MP is preferentially methylated to yield methylmercaptopurine (MeMP)
Blaker PA , Arenas-Hernandez M , Smith MA , Shobowale-Bakre EA , Fairbanks L , Irving PM , Sanderson JD , Marinaki AM
Tuesday, 4 June, 2013
Genetic markers associated with toxcity to fluoropyrimidine therapy
Fluoropyrimidine drugs are extensively used for the treatment of solid cancers.
Loganayagam A, , Arenas-Hernandez M , Corrigan A , L Fairbanks , Lewis CM , Harper P , Maisey N , Ross P , Sanderson JD , Marinaki AM
Tuesday, 30 April, 2013
The influence of gender and haemoglobin on TPMT activity
Pre-treatment measurement of red blood cell (RBC) thiopurine-S-methyltransferase (TPMT) activity is recommended to guide initial dosing of azathioprine (AZA) and mercaptopurine (MP).
P A Blaker , V C Kariyawasam , K V Patel , R M Goel , M G Ward , P M Irving , , J D Sanderson
List Grid
Erin Emmett
Principal Clinical Scientist
Monica Arenas-Hernandez
Principal Clinical Scientist

Purine Research Laboratory at St Thomas'

020 7188 1266
St Thomas’ Hospital
North Wing - 4th Floor
Westminster Bridge Road
London SE1 7EH

Last updated: 14/11/2025

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Viapath is a founding member of The Association of Independent Pathology Providers (AIPP), which is a trade association representing innovative research-based diagnostic testing companies. 

Copyright 2014-2025 Synnovis Group LLP. Synnovis, the Synnovis logo and Nutris are registered trademarks of Synnovis Group LLP.

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