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Background:  The free β subunit of human chorionic gonadotropin (free β-hCG) is an important serum marker for biochemical screening.  Its weekly median value varies with ethnicity.  Most of the fluorometers for lanthanide chelates are designed for the detection of signals from europium (Eu 3+ ) chelates only.

clinical chemistry and laboratory medicine

Determination of median levels of the free β subunit of human chorionic gonadotropin in women from mainland China using a new time-resolved fluoroimmunoassay