High CA-125 Levels: Is a 900+ Result Terminal? - Obstetrics and Gynecology

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A CA-125 level exceeding 900 is indicative of a significant elevation, which may suggest advanced-stage ovarian cancer or other serious conditions. However, CA-125 is not solely used to


Hello, doctor.
I discovered that my menstrual cycle was very regular between September and November 2022, which led me to consider whether my previous irregular cycles were due to unhealthy lifestyle habits.
I wanted to understand more, so I visited a gynecological clinic where an ultrasound revealed a tumor.
After evaluation, the doctor suspected it might be a 9 cm teratoma and advised me to go to the hospital for further examination.
At the hospital, they found a tumor on my right ovary measuring about 10 cm.
The physician explained that I needed to undergo surgery as soon as possible.
On the same day, which was the first day of my menstrual period, I had blood tests done.
After reviewing the test results, everything appeared normal, except for the CA-125 level, which was over 900.
I have searched online extensively but have not found any instances of CA-125 levels reaching over 900.
I would like to understand if this indicates late-stage cancer.
If it is indeed late-stage, I plan to cease treatment and focus on completing the things I want to achieve in my life, as well as properly planning my affairs.
Therefore, I am reaching out to you for guidance.

Joi, 20~29 year old female. Ask Date: 2023/01/31

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, whether it is benign or malignant can only be determined after the tumor is surgically removed and sent for pathology examination.
It seems that there is a higher likelihood of it being benign.
Wishing you good health.

Reply Date: 2023/01/31

More Info


High levels of CA-125, particularly a result exceeding 900, can indeed be concerning, but it is essential to understand the context and implications of this marker. CA-125 (Cancer Antigen 125) is a protein that is often elevated in women with certain types of cancers, particularly ovarian cancer. However, it is not exclusively a cancer marker; elevated levels can also be associated with benign conditions such as endometriosis, pelvic inflammatory disease, and even menstruation.
In your case, the discovery of a significant ovarian tumor (approximately 10 cm) alongside a CA-125 level of over 900 raises the suspicion of malignancy, particularly ovarian cancer. However, it is crucial to note that a high CA-125 level alone does not confirm a terminal diagnosis. The interpretation of CA-125 levels must be done in conjunction with imaging studies, clinical findings, and histopathological examination post-surgery.

The fact that you had a stable menstrual cycle prior to this incident and the sudden discovery of a tumor suggests that there may have been underlying issues that were not previously detected. The recommendation for surgery is a standard approach in such cases, as it allows for a definitive diagnosis through histological examination of the tumor tissue. This is critical because the treatment and prognosis can vary significantly depending on whether the tumor is benign or malignant.

It is understandable to feel anxious about the implications of a high CA-125 level, especially with the fear of it indicating a terminal condition. However, it is important to remember that many patients with elevated CA-125 levels can have successful outcomes, especially when detected early and treated appropriately. The prognosis often depends on various factors, including the stage of the disease, the type of tumor, and the overall health of the patient.

If the tumor is confirmed to be malignant, treatment options may include surgery, chemotherapy, or targeted therapies, depending on the specific diagnosis and staging. Engaging in open discussions with your healthcare team about your concerns, treatment options, and potential outcomes is vital. They can provide you with a clearer picture based on your specific situation and guide you through the next steps.

In summary, while a CA-125 level of over 900 is concerning and warrants further investigation, it does not automatically equate to a terminal diagnosis. The next steps, including surgery and further testing, will provide more clarity. It is essential to stay informed, seek support, and maintain open communication with your medical team as you navigate this challenging time.

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