Many people have never heard the term "secondary infertility"; fewer understand it. I discovered it a year into my struggle to conceive a second child and fell on it, amazed. What I was undergoing had a name! I wrote it down and immediately felt better, as if the phrase exuded a talismanic power that might protect me from the likes of my neighbour.
First, consider where the information about the success rates is coming from. Generally speaking, IVF success rates in the United States comes from the clinics themselves or from the Center for Disease Control and Prevention. The Society for Assisted Reproductive Technology and the American Society for Reproductive Medicine both contribute to the CDC data.
Disclaimer: The information you enter is not stored by CDC and is only used to estimate your chances of success. The IVF success estimator does not provide medical advice, diagnosis, or treatment. These estimates may not reflect your actual rates of success during ART treatment and are only being provided for informational purposes. Estimates are less reliable at certain ranges/values of age, weight, height, and previous pregnancy and ART experiences. Please see your doctor and/or healthcare provider for a personalized treatment plan that is best for you.
Assisted hatching. About five to six days after fertilization, an embryo "hatches" from its surrounding membrane (zona pellucida), allowing it to implant into the lining of the uterus. If you're an older woman, or if you have had multiple failed IVF attempts, your doctor might recommend assisted hatching — a technique in which a hole is made in the zona pellucida just before transfer to help the embryo hatch and implant. Assisted hatching is also useful for eggs or embryos that have been previously frozen as the process can harden the zona pellucida.

Unlike the simpler process of artificial insemination -- in which sperm is placed in the uterus and conception happens otherwise normally -- IVF involves combining eggs and sperm outside the body in a laboratory. Once an embryo or embryos form, they are then placed in the uterus. IVF is a complex and expensive procedure; only about 5% of couples with infertility seek it out. However, since its introduction in the U.S. in 1981, IVF and other similar techniques have resulted in more than 200,000 babies.
There are multiple strategies for causing ovulation in clomid or letrozole resistant patients. Some of these include adding medications such as dexamethasone or metformin to the treatment regimen. Another approach is changing to gonadotropin injections. Rather than tricking the brain into sending a stronger signal to the ovaries to cause follicle recruitment, gonadotropins directly stimulate the ovary to recruit multiple follicles.
Since marriage is a contract between the wife and husband during the span of their marriage, no third party should intrude into the marital functions of sex and procreation. This means that a third party donor is not acceptable, whether he or she is providing sperm, eggs, embryos, or a uterus. The use of a third party is tantamount to zina, or adultery.
The Catechism of the Catholic Church, in accordance with the Catholic understanding of natural law, teaches that reproduction has an "inseparable connection" to the sexual union of married couples.[128] In addition, the church opposes IVF because it might result in the disposal of embryos; in Catholicism, an embryo is viewed as an individual with a soul that must be treated as a person.[129] The Catholic Church maintains that it is not objectively evil to be infertile, and advocates adoption as an option for such couples who still wish to have children.[130]
Next, we’ll look at data that compares PCOS patients who took clomid alone or clomid accompanied by IUI (no studies use letrozole, so we are forced to use a study with clomid). Clomid alone produced a 17% live birth rate after 3 cycles, while clomid plus IUI produced a 19% live birth rate. Investigators concluded there was no statistically significant difference.
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At the same time, in older women, the IVF success rates can vary dramatically, and that’s why it’s so important to focus only on live births. For example, a clinic may have a very high pregnancy rate among older women, but a low live birth rate. Or, the rates may be quite high – 40% or even 50% – but only after four or five rounds. That makes a very big difference, especially in the overall cost of treatment!
^ Baker VL, Luke B, Brown MB, Alvero R, Frattarelli JL, Usadi R, et al. (September 2010). "Multivariate analysis of factors affecting probability of pregnancy and live birth with in vitro fertilization: an analysis of the Society for Assisted Reproductive Technology Clinic Outcomes Reporting System". Fertility and Sterility. 94 (4): 1410–6. doi:10.1016/j.fertnstert.2009.07.986. PMID 19740463.

Time. The factor of time cuts both ways when you are weighing up these two options. IUI is a much shorter process than IVF, so if your first cycle is successful, it could be the quickest route to bringing home a baby. However, because of the gap in success rates between the two treatments, some patients in their late 30s to early 40s may get pregnant faster by going directly to IVF rather than waiting until they have had several failed IUI cycles.

Success rates for IVF depend on a number of factors, including the reason for infertility, where you're having the procedure done, and your age. The CDC compiles national statistics for all assisted reproductive technology (ART) procedures performed in the U.S., including IVF, GIFT, and ZIFT, although IVF is by far the most common; it accounts for 99% of the procedures. The most recent report from 2016 found:

3-6 months of treatment with Clomid pills (clomiphene citrate) might improve fertility by as much as 2 times as compared to no treatment. This is a very low level infertility treatment. Infertility specialists do not usually recommend Clomid treatment( without insemination) for unexplained infertility for women over the age of about 35. Most fertility specialists do not use it (without IUI) on any couples with unexplained infertility. If a woman is already having regular periods and ovulating one egg every month, giving Clomid, which will probably stimulate the ovaries to release 2 or 3 eggs per month (instead of one) is not really fixing anything that is broken - and is not likely to be successful.
While many cases of infertility remain unexplained, there may be answers in the epigenome. Unlike one’s genetic code, the epigenome is dynamic and can be modified by environmental factors and lifestyle choices. Fertility in many cases is a state which changes throughout one’s life. Given the lack of clear genetic or physiological causes of unexplained infertility, the epigenome is thought to be altered in this subset of patients. As a result, looking into the epigenetic basis of infertility can help clinicians inform treatment.
Disclaimer: The information you enter is not stored by CDC and is only used to estimate your chances of success. The IVF success estimator does not provide medical advice, diagnosis, or treatment. These estimates may not reflect your actual rates of success during ART treatment and are only being provided for informational purposes. Estimates are less reliable at certain ranges/values of age, weight, height, and previous pregnancy and ART experiences. Please see your doctor and/or healthcare provider for a personalized treatment plan that is best for you.
Infertility can have a profound impact on one’s mental health. When men and women find out that they can’t conceive, they may experience the same painful emotions as anyone coping with grief or profound loss. Common reactions include shock, frustration, grief, anger, decreased self-esteem, anxiety, and depression, but feelings about infertility can vary greatly depending on the source of the problems. Men, in particular, find it far easier to deal with a partner’s infertility than with their own.

The diagnosis is one of exclusion — that is, one which is made only after all the existing tests have been performed and their results found to be normal. This is why the frequency of this diagnosis will depend upon how many tests are done by the clinic — the fewer the tests, the more frequent this diagnosis. And the better the tests, the more likely you are getting a diagnosis instead of being told it's "unexplained."

Obesity: The obesity epidemic has recently become is a serious issue, particularly in industrialized nations. The rising number of obese individuals may be due in part to an energy-rich diet as well as insufficient physical exercise.  In addition to other potential health risks, obesity can have a significant impact on male and female fertility. BMI (body mass index) may be a significant factor in fertility, as an increase in BMI in the male by as little as three units can be associated with infertility. Several studies have demonstrated that an increase in BMI is correlated with a decrease in sperm concentration, a decrease in motility and an increase DNA damage in sperm. A relationship also exists between obesity and erectile dysfunction (ED). ED may be the consequence of the conversion of androgens to estradiol. The enzyme aromatase is responsible for this conversion, and is found primarily in adipose tissue. As the amount of adipose tissue increases, there is more aromatase available to convert androgens, and serum estradiol levels increase. Other hormones including inhibin B and leptin, may also be affected by obesity. Inhibin B levels have been reported to decrease with increasing weight, which results in decreased Sertoli cells and sperm production. Leptin is a hormone associated with numerous effects including appetite control, inflammation, and decreased insulin secretion, according to many studies. Obese women have a higher rate of recurrent, early miscarriage compared to non-obese women.
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