The international definition of infertility (ESHRE, ASRM, NICE) is 12 months of trying without a positive under 35, or 6 months over 35. The book refines it by age: 12 months under 35, 6 months from 35 to 40, 3 months at 41 to 42 and immediate evaluation from 43. And some situations in your history, or your partner's, mean you should not wait at all.
Not waiting too long matters just as much as not giving up too soon. The 12 or 6 month rule is only the starting point: you need to know your own cutoff, because it isn't the same for every TTC woman.
| Age | How long before evaluating | Why |
|---|---|---|
| Under 30 | 12 months | Full ovarian reserve |
| 30 to 34 | 12 months | Reserve beginning to decline |
| 35 to 37 | 6 months | Accelerating egg loss |
| 38 to 40 | 6 months | Reduced egg quality |
| 41 to 42 | 3 months | Time is a critical factor |
| 43 and over | Immediate evaluation | Limited biological window |
Cutoffs as given in Chapter 29. The 12 and 6 month definition comes from ESHRE, ASRM and NICE.
These are cutoffs for getting evaluated, not deadlines for giving up. If you are 35 or older, the reasons the clock runs faster are covered on its own page.
There are plenty of cases where waiting less is not just reasonable but medically recommended. Do not wait 12 or 6 months. See a specialist right away if you have:
Two items on this list are about him. Your partner's history counts in the timeline just as much as yours.
There are several kinds of professionals, and choosing the right one matters:
This is Chapter 29 of Map to the Positive, the opening of Station IV, Signs. From here the book goes on to the red flags that call for immediate evaluation, how to choose the right doctor, the tests of the advanced workup, the most common diagnoses and the treatments available, from the simplest up to assisted reproduction.
Take 30 days. If it does not give you more clarity than everything you have read for free so far, ask for a refund and you get every cent back. We cannot promise you a pregnancy. We can promise you will not be guessing.
References: ESHRE Guideline on the Management of Infertility, 2023. · ASRM Practice Committee. Diagnostic evaluation of the infertile female, 2021. · NICE Clinical Guideline 156. Fertility: assessment and treatment.