[Digoxin assay: results of 10 years of intralaboratory controls].

Ann Biol Clin (Paris)

ProBioQual, Villeurbanne.

Published: January 2006

Serum digoxin measurement is often performed in medical laboratories. A professional association specialized in quality control, based in Lyon, has been organizing punctual controls of medication measurement for the past ten years. The results are analysed in term of intra and inter-technique precision, difference between methods and specificity in regard to endogenous or exogenous interfering substances. Methods have changed with a quasi disappearance of the methods used ten years ago (FPIA, EMIT) and introduction of new technologies on recent immunoanalysis automates. The results observed with the different instruments are similar. Reproductibility has not changed over ten years. Some difficulties remain in the measurement of low concentrations of digoxin. Many substances interfere in digoxin measurement : digoxigenine (inactive metabolite), endogenous digoxin-like immunoreactive factors, spironolacton, antidigoxin antibodies used for treatment of digitalic intoxications. These interferences depend on the method which is used, but it is essential to know them in order to interpret the results correctly.

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