Unexplained (idiopathic) infertility: the "doctors can't figure it out

Unexplained infertility includes infertility cases in which the standard infertility testing has not found a cause for the failure to get pregnant. Unexplained infertility is also referred to as idiopathic infertility. Another way to explain it is the "doctors can't figure it out" group.
Though the definition of what "standard testing" consists of is not agreed upon by all experts. Medical studies have reported that 0-26% of infertile couples have unexplained infertility. The most commonly reported figures are between 10-20% of infertile couples.

However, those percentages are from studies in which all the women had laparoscopy surgery to investigate the pelvic cavity for pelvic scarring and endometriosis. Laparoscopy surgery is no longer done as part of the routine fertility workup. Therefore, one are not finding all of the causes of infertility that we used to - leaving many more couples in the unexplained category.
The current rate of unexplained infertility is about 50% for couples with a female partner under age 35, and about 80% by age 40 (see discussion below about age)
In reality, there are probably hundreds of "causes" of infertility
There are a lot of things that have to happen perfectly in order to get pregnant and have a baby

As for acupuncture and herbal medicine, we have traditional methods of diagnosis, the standard test is only one of the reference we look at. Therefore, when the conventional medicine calls "Unexplained", we may have something to find out.