For many women in the United States, the perimenopause is characterized by irregular menstrual cycles and menopausal discomforts (e.g. hot flashes). Clinically, there is great intra- and inter-individual variation in hormone levels. The purpose of this study was to assess variation in urinary LHlevels in relation to menopausal hot flashes. Data were drawn from a study of the menopause transition in Western Massachusetts (n=155). Urine samples from women aged 45 and older who reported at least one menstrual period within the 12 months prior to interview were tested for elevated LH levels using OvuKIT Self-Test (n=54). In this preliminary report, hot flash frequency varied in relation to phases of the menstrual cycle (p<.05).High/low levels of urinary LH by menstrual cycle phase (i.e., "on-time" vs. "off-time" elevated LH levels) were not assodated with hot flash experience, although the expected trend was demonstrated.