Several studies indicated the presence of an hCG-immunoreactive substance in commercial hMG preparations. Because hCG represents LH activity with a relatively very long half-life, differences between hMG preparations with respect to hCG content could imply clinical differences. To investigate whether there is any difference in this respect between the two most widely used hMG preparations, we measured the hCG content of ampules of Humegon and Pergonal retrieved from the market, together representing 51 separate production batches, with one or more different specific immunological assays. There are no significant differences between Humegon and Pergonal with respect to the mean hCG level per ampule as measured by RIA, ELISA, and Delfia. The batch-to-batch consistency for Humegon is higher.
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