Female infertility occurs when the woman does not conceive after one year of attempting to become pregnant. Other signs and symptoms depend on the underlying cause of the woman's infertility.
In about 15% of cases the infertility investigation will show no abnormalities. In these cases abnormalities are likely to be present but not detected by current methods. Possible infertility problems could be that the egg is not released at the optimum time for fertilisation, that it may not enter the fallopian tube, sperm may not be able to reach the egg, fertilisation may fail to occur, transport of the zygote may be disturbed, or implantation fails. It is increasingly recognised that egg quality is of critical importance and women of advanced maternal age have eggs of reduced capacity for normal and successful fertilisation
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