I've just been reading about yet another type of body clock testing - see this
It sounds like a great idea - take a simple test and see how late you can leave it to try to get pregnant. However, there are a number of problems.
For a start, this particular body clock test costs £350 - a tidy sum for a scan and some bloods... Perhaps you could justify shelling out that much if you were worried about your declining fertility and seeking some reassurance - but that's exactly where the second problem lies. The results could suggest that you're in tip top reproductive condition, nowhere near the menopause, and have some years to go. What they won't show is any other underlying fertility problems you may have, such as blocked fallopian tubes. You could risk delaying starting to try for a baby until it's too late for you - all because this test showed that your ovaries looked fine.
These tests also work on the premise that if there is a problem, you'll be able to freeze your eggs right away as an insurance policy against reproductive ageing. And that's the final issue. Egg freezing is still a relatively new science, and having eggs in the freezer doesn't guarantee a future pregnancy. It is expensive and is only worth doing if you understand the limitations and have no other options.
So, body clock testing may sound sensible - but should probably be taken with a large pinch of salt!