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- W66996831 abstract "The beta core fragment of hCG (beta C-hCG) accounts for a large proportion of hCG immunoreactivity in the urine of pregnant women. It is often increased in the urine of patients with gynecologic tumors and may become an important diagnostic tool in early pregnancy and cancers. Despite the importance of beta C-hCG, little is known about its stability in urine under conditions of differing pH and temperature. This study examined the effect of repeated freeze-thaw cycles; storage at room temperature, 4C, and -20 C over several months; and the effect of alteration of urine pH. The two specific immunoassays for beta C-hCG used do not significantly cross-react with intact hCG or the free alpha subunit. Despite different cross-reactivities of the antibodies to the free beta subunit and higher immunoactivity when the radioimmunoassay was used, there was excellent correlation between the two assays in pregnancy urine. This suggests that there is little free beta subunit in urine from pregnant women. In addition, this study evaluated the stability of intact hCG and beta-hCG under identical conditions. No alterations in their immunoactivities were found under most conditions of storage. It is concluded that, for clinical purposes, beta C-hCG as well as intact hCG and free beta subunit are very stable molecules." @default.
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- W66996831 date "1991-01-01" @default.
- W66996831 modified "2023-09-23" @default.
- W66996831 title "Stability of immunoreactive beta-core fragment of hCG." @default.
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