Factors Affecting the Radioimmunoassay of Digoxin

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Abstract
We ascertained which factors critically affect the radioimmunoassay of digoxin. These include: products of hemolysis in blood plasma, excessive amounts of bilirubin in the plasma of jaundiced patients, the age of the tritiated digoxin, the presence of gamma-emitting radioisotopes in the plasma from diagnostic tests, the binding tendency of plasma proteins for digoxin, chemiluminescence associated with the serum (or plasma) of uremic patients, and excessive delay between sample collection and assay of unfrozen samples.

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