[Modification of a radioimmunological double-antibody method for human chorionic somatomammotropin (HCS) as a rapid test suitable for high concentrations in the late pregnancy].

A rapid and reproducible double antibody radioimmunoassay for plasma human chorionic somatomammotropin is described. The assay can routinely be performed by incubation for three hours (37 degrees C). The different steps of this method and precision of test modifications were evaluated. Levels of HCS of 222 normal pregnant women between the 24th and 40th week of pregnancy were investigated in order to determine the normal range of HCS levels during pregnancy.