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Drug interference with thyroid-binding globulin — Clinical Guidelines

Overview

Drug interference with thyroid-binding globulin (TBG) can affect the measurement of thyroid hormones, leading to potential misinterpretation of thyroid function tests. Certain medications can bind to TBG, altering its capacity to transport thyroid hormones and thus impacting diagnostic accuracy 7.

Diagnosis

Monitor for discrepancies between clinical symptoms and thyroid function test results.

Consider measuring free T4 and TSH levels to account for TBG interference.

Evaluate patient medication history for drugs known to interfere with TBG 7.

Management

Adjust diagnostic approach by using free hormone measurements when TBG interference is suspected.

Review and potentially adjust medication regimens that interfere with TBG, under clinical supervision.

Regular follow-up with comprehensive thyroid function assessments to monitor changes 7.

Special Populations

No specific guidelines provided for pregnancy, pediatrics, elderly, or comorbidities regarding TBG interference in the given abstracts.

Key Recommendations

Always consider patient medication history when interpreting thyroid function tests to identify potential TBG interference (Evidence: Expert opinion 7).

Utilize free hormone measurements in patients on medications known to interfere with TBG to ensure accurate assessment of thyroid status (Evidence: Expert opinion 7).

Implement regular reassessment of thyroid function tests in patients with persistent discrepancies despite clinical stability, especially if on multiple medications (Evidence: Expert opinion 7).

References

1 Sagi S, Cohen HP, Woollett GR. Pharmacovigilance of Biologics in a Multisource Environment. Journal of managed care & specialty pharmacy 2017. link 2 Grampp G, Felix T. Pharmacovigilance Considerations for Biosimilars in the USA. BioDrugs : clinical immunotherapeutics, biopharmaceuticals and gene therapy 2015. link 3 Ebbers HC, Mantel-Teeuwisse AK, Sayed-Tabatabaei FA, Moors EH, Schellekens H, Leufkens HG. The role of Periodic Safety Update Reports in the safety management of biopharmaceuticals. European journal of clinical pharmacology 2013. link 4 Lapi F, Vietri M, Moschini M, Cecchi E, Pugi A, Lucenteforte E et al.. Potential drug-drug interactions and radiodiagnostic procedures: an in-hospital survey. Pharmacy world & science : PWS 2010. link 5 Zuñiga L, Calvo B. Biosimilars: pharmacovigilance and risk management. Pharmacoepidemiology and drug safety 2010. link 6 Zhang W, Wang H, Wang J, Li X, Jiang H, Shen J. Multiresidue determination of zeranol and related compounds in bovine muscle by gas chromatography/mass spectrometry with immunoaffinity cleanup. Journal of AOAC International 2006. link 7 De Giovanni N, Fucci N. Hypothesis on interferences in kinetic interaction of microparticles in solution (KIMS) technology. Clinical chemistry and laboratory medicine 2006. link 8 Rule GS, Mordehai AV, Henion J. Determination of carbofuran by on-line immunoaffinity chromatography with coupled-column liquid chromatography/mass spectrometry. Analytical chemistry 1994. link 9 Yap WT, Locascio-Brown L, Plant AL, Choquette SJ, Horvath V, Durst RA. Liposome flow injection immunoassay: model calculations of competitive immunoreactions involving univalent and multivalent ligands. Analytical chemistry 1991. link

Drug interference with thyroid-binding globulin