Women who are keen to start a family in the future but ideally want to postpone until later in life can now visit a national network of centres to test their fertility.
The Body Clock Test gives women an indication of their future fertility so that they can decide whether waiting is prudent.
Figures show that nearly 20 per cent of women leave trying for a baby until after they are 35 years of age.
It is only then that many realise they need infertility treatment, with some discovering they have simply left it too late to start a family.
Professor Bill Ledger, from Sheffield University, explained: "Women do not realise the importance of age when it comes to fertility.
"They think, 'It won't happen to me, I'm 37, I go to the gym twice a week, I don't drink, I don't smoke, I'm fit - everything about me is young'. Well it is - except your ovaries."
Women can now visit the UK Body Clock Network - which has clinics across the country - and undergo a blood test and scan which provide clues to future fertility.
Centres are located in Glasgow, Newcastle, Sheffield, Birmingham, Cambridge, London, Cardiff and Southampton, with more planned for the near future.