Ovulation is normally associated with a dip in basal body temperature, and normal luteal function with a temperature rise. Basal body temperature is therefore a useful means of documenting ovulation. When hyperprolactinaemic patients have had their prolactin levels and periods restored to normal by bromocriptine therapy, they usually demonstrate a biphasic temperature pattern. One patient had suffered from polymenorrhoea for many years and was found to be hyperprolactinaemic. Bromocriptine normalised her periods, and therapy was withdrawn after one year.
