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The levels of HCS in plasma at different times during uncomplicated pregnancies were studied by a rapid radio-immunoassay. A steady rise was observed from the 22nd to the 37th week. After the 37th week, the HCS levels were fairly stable. The HCS levels were virtually unchanged in plasma samples stored at + 4°C or - 20°C for 1 to 7 days.
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Lindberg et al. (1972) studied this question.
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