[Quantitation of plasma progesterone using a commercial immunoassay. Comparison with a specific radioimmunoassay]

Plasma progesterone (P) was determined by enzymeimmunology with commercially available kits. Two kits (Serono and bioMérieux) were studied. The results obtained by either enzymeimmunoassay were compared to reliable and specific radioimmunoassays. The bioMérieux kit was shown to be more appropriate than the Serono kit for plasma P assay except in patients after oral administration of micronized progesterone because of the interference of the high levels of P metabolites.