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Isotope dilution tandem mass spectrometric method for T4/T3
Nadia Soukhova1, Offie P Soldin, Steven J Soldin
1Bioanalytical Core Laboratory, Georgetown Clinical Research Center, Georgetown University, Washington, DC 20007-2197, USA.
Summary
A new isotope dilution tandem mass spectrometry method accurately and specifically measures thyroid hormones thyroxine (T4) and 3,5,3'-triidothyronine (T3) simultaneously in serum, offering a faster alternative to immunoassays.
Area of Science:
- Clinical Chemistry
- Analytical Chemistry
- Endocrinology
Background:
- Thyroid hormones thyroxine (T4) and 3,5,3'-triidothyronine (T3) are crucial for biological regulation.
- Current immunoassay methods for thyroid hormone measurement lack specificity.
Purpose of the Study:
- To develop a method for simultaneous measurement of T4 and T3 using isotope dilution tandem mass spectrometry (MS/MS).
- To compare MS/MS results with immunoassay results from the same serum samples.
Main Methods:
- Utilized an API-3000 tandem mass spectrometer with HPLC and isotope dilution.
- Employed deuterium-labeled internal standards and a C-18 column for separation.
- Serum protein precipitation followed by methanol gradient elution was performed.
Main Results:
- The developed MS/MS method allows simultaneous determination of total T4 and T3 in serum.
- The method demonstrated accuracy, specificity, and precision (%CVs 3.5-9.0).
- The assay is simple, fast, with run times under 7 minutes.
Conclusions:
- Isotope dilution tandem mass spectrometry provides an accurate and specific method for simultaneous T4 and T3 measurement.
- This MS/MS method is a viable, efficient alternative to traditional immunoassays for thyroid hormone analysis.