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Differences in circulating insulin levels following glargine administration

Fidaa Ibrahim1, Georges Bagnard, Philippe Boudou

  • 1Unit of Transfert in Molecular Oncology and Hormonology, Saint-Louis University Hospital, Assistance-Publique Hôpitaux de Paris, France.

Clinical Biochemistry
|December 28, 2007
PubMed

Insights

Two insulin immunoassays were evaluated in routine practice. The electro-chemiluminescent immunoassay (ECLIA) showed higher insulin results than the IRMA assay, particularly in patients treated with glargine insulin.

Area of Science:

  • Endocrinology
  • Clinical Chemistry
  • Laboratory Medicine

Background:

  • Accurate insulin measurement is crucial for diagnosing and managing metabolic disorders.
  • Two common immunoassays, IRMA and ECLIA, are used for insulin quantification.
  • Understanding assay performance in routine practice, especially with specific treatments like glargine, is essential.

Purpose of the Study:

  • To compare the performance of two-site non-competitive insulin immunoassays, the BI-INSULIN assay (IRMA) and an electro-chemiluminescent immunoassay (ECLIA), in routine clinical practice.
  • To assess the impact of glargine treatment on insulin measurements obtained by these assays.

Main Methods:

  • A study involving 145 consecutive patients from an Endocrine Department was conducted.
  • Patients underwent general endocrine and metabolic status investigations.
  • Insulin levels were measured using both the IRMA and ECLIA methods.

Main Results:

  • The ECLIA consistently yielded higher insulin results compared to the IRMA assay across most patients.
  • A notable exception was observed in six patients treated with glargine, where the difference was less pronounced or reversed.
  • This suggests a potential influence of glargine or its metabolites on assay performance.

Conclusions:

  • Insulin levels measured by the Elecsys (ECLIA) system in patients treated with glargine are directly correlated with glargine biotransformation into its detectable metabolite (M1).
  • The findings highlight the importance of considering specific therapeutic agents, such as glargine, when interpreting insulin immunoassay results.
  • Assay selection and interpretation should account for potential interferences or specific analyte biotransformation pathways.
Abstract

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