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In vitro assays to test the interference of anti-thyroglobulin antibodies on thyroglobulin measurement
Deolinda Madureira1, Susana Prazeres, Márcia São Pedro
1Laboratório de Endocrinologia, Instituto Português de Oncologia de Lisboa, Francisco Gentil E.P.E., Rua Professor Lima Basto, 1099-023, Lisbon, Portugal. dmadureira@ipolisboa.min-saude.pt
Objective:
To assess the interference of anti-thyroglobulin antibodies (TgAb) on serum thyroglobulin (Tg) measurement by in vitro experiments. Design Re-evaluation of Tg concentration after dilution with different TgAb-positive sera. On a first step, dilutions of the same Tg with different TgAb sera were performed and on a second step, different Tgs were diluted with the same TgAb serum.
Methods:
Tg measurements were performed using an immunometric (IMA) chemiluminescence assay. TgAb measurements were performed using two methods: immunoflurimetric assay (UNICAP 100) and IMA chemiluminescent assay (IMMULITE 2000).
Results:
Dilution of a known concentration of Tg with different TgAb-positive sera resulted in a variation of the final concentration of Tg ranging from -24 to -79%. A weak correlation was observed between the TgAb concentration and the percentage of the Tg deviation. Dilution of different Tgs with the same TgAb-positive serum illustrated how the same TgAb positive serum may determine a high interference or a neutral effect.
Conclusions:
Present results suggest that the interference on Tg measurement observed in the presence of TgAb may result not only from the anti-thyroglobulin antibodies, but also from the thyroglobulin itself.
