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  • [Inappropriately undetectable thyroglobulin after exclusion of interference from thyroglobulin antibodies].

[Inappropriately undetectable thyroglobulin after exclusion of interference from thyroglobulin antibodies].

Annales de biologie clinique (2011-11-30)
Perrine Munier, Françoise Courtier, Kildie Barrial, Karim Chikh, Francine Claustrat, Thierry Le Bricon, Jacques Bronner, Edgar Sanabria
ANOTACE

Thyroglobuline (Tg) is a large molecule of high molecular weight mainly indicated in monitoring differentiated thyroid cancer (DTC), its measurement remains difficult. We report the case of a patient who underwent total thyroidectomy for a poorly differentiated thyroid insular carcinoma. Despite several (131)I treatments, a progressive elevation of serum Tg is observed. A control performed in another laboratory using an immunoradiometric assay (IRMA Cisbio) returns an undetectable value (< 0,2 mg/L). A new sample was simultaneously sent to different laboratories. Three nonisotopic immunometric assays showed high values of Tg while the IRMA assay, considered the gold standard, gave a result below the detection threshold. The absence of Tg antibodies and of anti-mouse antibodies was confirmed. The IRMA Kit manufacturer agreed to carry out an expertise. After changing their detection antibody, the presence of a high Tg was demonstrated, in agreement with non-isotopic techniques. The expertise conclusion was a lack of detection by the IRMA Tg assay. This incident was notified to AFSSAPS by the manufacturer.

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Sigma-Aldrich
Thyroglobulin from bovine thyroid, (For Gel Filtration Chromatography)