There are only a few days each cycle when a woman can conceive, the days leading up to and including the day of ovulation. But cycles are variable and so is the timing of ovulation, which means that 1 in 2 women could be trying to conceive at the wrong time of the cycle(1).
These simple urine tests are over 99% accurate at detecting the rise in a key fertility hormone (luteinising hormone) 24-36 hours before ovulation. A clear smiley face appears in the digital display when your LH surge has been detected, so you know this day and the following day are your best 2 days to try for a baby.
(1)Johnson SR., et al. Hum. Repro. (2011) 26: i236.
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