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The diagnosis of Unexplained Infertility is used when no cause for the infertility can be found in either partner.

Sperm Count

Temperature Chart	Ovulation can almost always be detected by analysing the previous temperature charts.
Blood Tests	By having several blood tests each week for a full cycle checks can be made on the level of progesterone produced by the ovaries.
Endometrial biopsy	This is done by taking a small sample from inside the womb to check whether the lining of the womb is "in phase" with the time of the menstrual cycle. This test can be done without an anaesthetic, or as part of a full curette.

Hysterosalpingogram	This X-Ray of the tubes can determine whether the internal shape of the uterus is normal and if the tubes are blocked.
Laparoscopy	This investigation, done under general anaesthetic, allows the doctor to visualise the tubes, ovaries and other pelvic structures.

Post Coital Test	At the time of ovulation, mucus is extracted from the cervix 4-12 hours after intercourse and the activity of the sperm is assessed.
Indirect Immumno Bead Test (IIBT)	Mucus and sperm are collected and mixed with coated beads in the laboratory. If the the sperm are not able to move properly and bind to the beads sperm antibodies are present.

There are some rare conditions which have been associated with unexplained infertility. However these do not always cause infertility. The tests are also often time consuming and expensive.

Try several treatments, in the hope that one may work, (i.e. Shot-gun therapy) or GIFT.

If this is the only abnormality found, your chance of getting pregnant without treatment after 3 years is about 1 in 3, if you have never been pregnant before. With IVF-related treatments your chances of getting pregnant may improve to 1 in 2, after 1 year.