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It is described as one of the fastest growing areas of medical "tourism" although that is a word none of those undertaking this journey like to use.
But is it costing too much in terms of emotional, physical and financial stress?
One couple, interviewed anonymously for BBC Scotland's The Investigation programme, said they had spent £90,000 already, and after 17 treatments in various places, including the US, are heading to Spain again this year for one last try at conceiving a longed-for baby.
This couple did not meet until their mid-30s, and by the time they went for treatment on the NHS, at 40 the patient was deemed too old to qualify by her local health board.
The couple have had to remortgage their house to raise funds, so the financial pressure has been enormous, but they have also been on an emotional and physical rollercoaster. And two miscarriages have made it all the more devastating.
It should be the most natural thing in the world, starting a family when the time is right, but for many thousands, it just...