Fertell measures men's 'concentration of motile sperm' and women's follicle stimulating hormone (FSH) levels, taken on day 3 of menses, to determine 'ovarian reserve'.It works much like the standard home pregnancy test, where there is a control line, and then another line that appears depending on what you are measuring. (In home pregnancy tests, the 2nd line usually means you have a positive pregnancy test).
It's been available in the UK for over a year, and is purportedly 95% accurate. Now available over the counter in the US, for about $100.
Their website has a video demo of how it all works.
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