The 39-year-old actress, who lost her mother, grandmother and aunt to cancer and carries a mutation in the BRCA1 gene, wrote in a piece to the New York Times that she was planning the surgery for some time.
The gene mutation gives Jolie an estimated 87 per cent risk of breast cancer and 50 per cent risk of ovarian cancer.
"I had been planning this for some time. It is a less complex surgery than the mastectomy, but its effects are more severe. It puts a woman into forced menopause.
"So I was readying myself physically and emotionally, discussing options with doctors, researching alternative medicine, and mapping my hormones for estrogen or progesterone replacement. But I felt I still had months to make the date," Jolie wrote.
The actress, who is married to Brad Pitt and raises three adopted and three biological children with him, said she decided to speed the process after getting a call from her doctor.
"Then two weeks ago I got a call from my doctor with blood-test results. 'Your CA-125 is normal,' he said. I breathed a sigh of relief. That test measures the amount of the protein CA-125 in the blood, and is used to monitor ovarian cancer. I have it every year because of my family history.
"But that wasn't all. He went on. 'There are a number of inflammatory markers that are elevated, and taken together they
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