['To determine the reliability of women, unmotivated by fertility problems, to accurately assess and record the urinary luteinizing hormone surge indicated by color changes on OvuQuick test pads.', 'A descriptive, correlational study testing the reliability and validity of an instrument.', "The participants' homes.", '114 college-educated, white women.', "An OvuQuick Test Kit and a Menstrual Cycle Diary were mailed to each participant. The monthly diary and test pads of the participants were reassessed by a master's-prepared nurse.", 'Women without medical or health-care training are reliable in judging the color changes on the OvuQuick test pads and recording these results in a menstrual diary.', 'Investigator and subject assessment and recording of luteinizing hormone surge results agreed 95% (284 of 300 instances) of the time. In addition, the validity of the luteinizing hormone surge for predicting ovulation was accurate in 93% (26 of 28 instances) of the cases.'] Does professional and lay interrater reliability of urinary luteinizing hormone surge measured by OvuQuick test?