Prediction of the potentially fertile period by urinary hormone measurements using a new home-use monitor: comparison with laboratory hormone analyses.

BACKGROUND The study compared a new urinary hormone monitoring system, Clearview Primera Fertility Monitor (CPFM), with laboratory hormone analyses in the prediction of the potentially fertile period. METHODS Thirty healthy female volunteers provided blood and early morning urine samples for one cycle. Serum oestradiol, progesterone and luteinizing hormone (LH), and urinary LH and oestrone-3-glucuronide (E3G) were measured. The fertility status of volunteers; Low, High or Peak, was collected from monitors and compared with the hormone measurements. RESULTS There was agreement between the first day of peak fertility and the urinary LH peak day in 65.6% of cycles and detection 1 or 2 days before the urinary LH peak day in 24.1 and 6.9% of cycles respectively. In 58.6% of cycles the system detected up to 5 days of increased fertility prior to the urinary LH peak day. Warning days of the urinary LH peak were similarly determined using defined thresholds of E3G and oestradiol providing up to 5 days warning in 82.8 and 96.6% of cycles respectively. CONCLUSIONS The system can provide couples attempting to conceive with information about the potentially fertile days in the cycle in order that they may time intercourse. It also has potential for use in evaluation and treatment of infertile couples.