[Radioactive immunoassay of digoxin during digitalis therapy (author's transl)]

Measurements of plasma-digoxin concentrations (radioactive immunoassay) after single oral administration of different doses of beta-methyldigoxin, given by tablets or drops, were made. Their behaviour after more prolonged treatment with the same cardiac glycoside was also evaluated. The utility of radioimmunoassay of serum digoxin levels during digitalis therapy is confirmed.