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A bioassay for luteinizing hormone (LH) activity is described. The method depends on progesterone synthesis by pooled, sliced rat ovarian tissue in vitro, the ovaries being obtained from immature rats pretreated with pregnant mare serum gonadotrophin.

The main advantage of the method is its increased sensitivity compared with the commonly used ovarian ascorbic acid depletion assay, its high degree of precision, and the fact that it allows the use of large numbers of well randomized samples from a small group of animals.