The investigation of amenorrhoea in women can be quite complex and tests depend on what the doctor finds out about you at your first visit.
Initially the doctor will ask you about your menstrual function since puberty, your life style and your sexual activity. They will want to know about any other condition you may be suffering from and what drugs you are on.
They will probably carry out a physical examination and want to take a blood sample. The blood sample is usually for the measurement of chorionic gonadotrophin (hCG), luteinising hormone (LH), follicle stimulating hormone (FSH) and prolactin. Other hormones which may be measured are testosterone and oestradiol. But blood analysis depends on what the doctor finds out from you and what he suspects may be the cause of your amenorrhoea.
Other, later tests may include ultrasound of the ovaries and possibly a scan of the head, genetic investigation and further blood tests.
Treatment depends on the cause of the amenorrhoea.