[The Human Menopausal Gonadotrophin Reference Standard (Control 961) of the National Institute of Health Sciences].

Raw human menopausal gonadotrophin (HMG) material was examined for preparation of the "Human Menopausal Gonadotrophin Reference Standard (Control 961)". The candidate material was assayed its follicle stimulating hormone (FSH) activity and luteinizing hormone (LH) activity against the 3rd International Standard for FSH and LH, urinary (71/264) by the augmented ovarian weight gain assay and the seminal vesicle weight gain test, respectively. The potency of the new standard was defined as 56 international units of FSH activity per mg and 61 international units of LH activity per mg as the result of 13 and 5 assays, respectively, in four collaborative laboratories.