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Forensic Isotope Ratio Mass Spectrometry (FIRMS)

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  • UKAS accredited proficiency testing scheme
  • Isotope Ratio Mass Spectrometry (IRMS) is a specialised technique that precisely measures small differences in the abundances of isotopes such as 2H/1H, 13C/12C, 15N/14N and 18O/16O. Subtle variations to the ‘natural’ abundance of these isotopes may be introduced during biological, chemical and physical processes.
  • These changes enable the differentiation of materials that otherwise may not be separated such that IRMS is used in many fields, such as archeology, medicine, geology, food authenticity and forensics.
  • Participation in the LGC FIRMS scheme will help laboratories demonstrate competence in this analytical technique. The scheme is operated by LGC Proficiency Testing and is supported by the FIRMS Network which provides input for the choice of test materials and scheme performance.
  • Scheme operates from January to December


Round dates


Despatch date

Reporting deadline

FM275 18 Mar 2019 26 Apr 2019
FM279 29 Jul 2019 06 Sep 2019



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