Abstract
ABSTRACT Experimental variables influencing the determination of plasma progesterone by competitive protein binding analysis have been further assessed. The precision of the method has been improved by additional mechanisation. Method interfering factors introduced by the extraction and purification procedure have been evaluated quantitatively. Another type of interfering material is present in plasma extracts from which all progesterone has been removed. The displacement effect of this material is additive to that derived from solvent and chromagram residues. Unless the various types of interfering material are taken into proper consideration, competitive protein binding methods for steroids may yield erroneous results.
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