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Miss North, a 31-year-old pharmaceutical company representative who lives with her partner at Laingholm in West Auckland, is certain she wants children - two, three, possibly even four.
But she also has a mortgage. So, like many women around her age, she is weighing the benefits of delaying childbearing - such as greater financial security - against the risk that if she waits too long she might need IVF fertility treatment or not be physically able to have them at all.
"Ideally I picture myself at about 35 having children rather than right at this minute."
But how long can she wait?
The blood test she plans to have next week should give her an idea. A check of her level of an ovarian hormone called anti-Mullerian will show how many eggs she has left, a predictor of her chances of becoming pregnant.
The new test - more sensitive than the existing method, which checks the level of follicle...