Testing labs in Cranmer Terrace

Analytical Services International (ASI) is an accredited bioanalysis and toxicology laboratory based at City St George's, University of London, Cranmer Terrace, London SW17 0RE, United Kingdom. Founded in 1983 by Professors Athol Johnston and David Holt, ASI has grown over more than four decades into one of the UK's leading specialist laboratories for forensic toxicology, clinical trial bioanalysis, therapeutic drug monitoring, drug material testing, and expert witness services. The laboratory serves a diverse client base spanning coroners, police forces, law enforcement agencies, clinicians, pharmaceutical companies, biotech organisations, contract research organisations (CROs), and academic partners across the UK and Ireland. ASI's commitment to quality is formally underpinned by ISO/IEC 17025:2017 accreditation, demonstrating technical competence across its defined scope of testing through validated methods and robust quality management systems. The laboratory also operates in full compliance with MHRA Good Laboratory Practice (GLP) and Good Clinical Practice (GCP) standards, enabling regulated analytical work for pharmaceutical submissions and clinical research. This combination of accreditations positions ASI as a trusted partner for regulatory-grade work across forensic, clinical, and pharmaceutical contexts. All analytical work is overseen by highly skilled scientists who combine deep technical expertise with the ability to communicate findings clearly and defensibly to varied audiences. ASI supports pharmaceutical companies, biotech organisations, and CROs with high-quality small molecule clinical bioanalysis services spanning the full drug development lifecycle. Bioanalytical capabilities include pharmacokinetic (PK) studies, metabolite profiling, biomarker analysis, dry blood spot (DBS) bioanalysis, and bespoke assay development tailored to individual research programmes. With an assay library covering more than 250 small molecule compounds and experience across more than 500 clinical and preclinical studies, ASI can rapidly mobilise validated methods or develop novel ones to specification. All clinical bioanalysis is conducted under GLP- and GCP-compliant conditions using state-of-the-art UHPLC-MS/MS and UHPLC-HRMS platforms combined with automated liquid handling for high-throughput sample processing. ASI's forensic toxicology team delivers comprehensive independent analysis and expert interpretation for coroners, pathologists, police forces, and legal professionals in both criminal and civil proceedings. The laboratory employs LC-MS/MS and high-resolution mass spectrometry (HRMS) for wide-scope drug and toxicant screening, quantification, and forensic interpretation across a range of biological matrices. Specialist assay capabilities extend to analytically challenging compounds including insulin, C-peptide, and GLP-1 agonists — analytes of increasing relevance in complex or unusual forensic cases. All results are delivered with clear, defensible scientific interpretation and full chain of custody documentation, and ASI scientists are available to provide expert witness testimony in court when required. As part of its ongoing expansion programme, ASI also provides drug material testing services focused on the rapid identification of seized materials and unknown substances. This service supports law enforcement decision-making, public protection, and active investigations by providing scientifically robust, court-ready identification of illicit, controlled, and novel psychoactive substances. The laboratory is also equipped to support emerging research programmes involving investigational therapeutic compounds such as Ketamine, Psilocin, DMTs, and LSD, where accurate quantification, validated method development, and GLP/GCP-compliant analytical conditions are required for proof-of-concept studies. ASI provides therapeutic drug monitoring (TDM) services to healthcare providers across the UK and Ireland, with a validated assay portfolio covering antipsychotic drugs, immunosuppressants, and cardiac drugs. Results are produced within clinically relevant turnaround timeframes to support active treatment decisions. A dedicated encrypted microsite allows clinicians to securely access clozapine monitoring results and track individual patient drug-level trends over time — a feature specifically designed to support safe prescribing in this high-risk patient population. TDM services represent a core component of ASI's mission to translate rigorous analytical science into meaningful clinical outcomes. ASI's scientists serve as independent expert witnesses in toxicology, pharmacology, and drug analysis for criminal and civil litigation. They produce clear, balanced, and scientifically rigorous reports that contextualise toxicological findings within the specific facts and circumstances of each case, addressing causation, pharmacological effect, impairment, and analytical limitations. Courtroom testimony is provided when required, and ASI's expert opinions are consistently recognised by legal professionals and judicial bodies for their clarity, accuracy, and scientific authority. Clients choose ASI for its combination of scientific expertise, advanced mass spectrometry instrumentation, and four-decade track record of quality and reliability. Its location within City St George's, University of London, provides sustained access to emerging scientific knowledge and expert collaboration. Whether supporting a phase I clinical bioanalysis programme, delivering forensic evidence in a complex toxicological case, enabling safe therapeutic drug management for hospital patients, or providing rapid analytical intelligence from seized drug materials, ASI consistently delivers accurate, timely, and insightful scientific analysis underpinned by ISO/IEC 17025:2017 accreditation and full MHRA GLP and GCP compliance.