Anomalous serum thyroxin measurements with the abbott TDx procedure

S. Levine, R. Noth, A. Loo, I. J. Chopra, G. G. Klee

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We describe a patient whose serum gave consistently low results for thyroxin as measured with the Abbott TDx but normal results by radioimmunoassay. Further clinical and laboratory studies did not support the low TDx results. Anti-thyroxin antibodies did not explain the discordant results, and we found no evidence of heterophilic antibodies in the patient's serum. We were unable to identify the cause of the problem.

Original languageEnglish (US)
Pages (from-to)1838-1840
Number of pages3
JournalClinical chemistry
Issue number10
StatePublished - 1990


  • Analytical error
  • Fluorescence polarization immunoassay
  • Radioimmunoassay compared

ASJC Scopus subject areas

  • Medicine(all)


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