Abstract: The present invention provides a method for predicting the likely timing of the onset of menopause for a perimenopausal female subject by determining the amount of hLH?cf in a sample from the subject comprising the steps of: (a) contacting a sample from the subject with an antibody which specifically binds to hLH?cf without substantially cross-reacting with hLH, hLH? or hLH?cf, under conditions permitting formation of a complex between the antibody and hLH?cf; (b) measuring the amount of complex formed, so as to thereby determine the amount of hLH?cf in the sample; and (c) comprising the amount of hLH?cf in the subject's sample determined in step (b) with either (i) the amount determined for known postmenopausal female subject or (ii) the amount determined for a sample from a known premenopausal female subject, wherein an amount of hLH?cf in the sample similar to the amount of hLH?cf in the known postmenopausal sample indicates temporal proximity to the onset of menopause, and an amount of hLH?cf in the sampl