If you have been struggling to conceive, your doctor has likely mentioned a hysterosalpingogram (HSG). It is a standard diagnostic procedure typically included in a comprehensive fertility evaluation to assess the health of the fallopian tubes.
But if you also suspect you have endometriosis, you might be wondering: can an HSG show endometriosis, or do I need a different test?
The relationship between HSG and endometriosis is a bit complex. While an HSG is a powerful tool, it is not a “catch-all” test for every pelvic condition. Let’s dive into what this test can (and cannot) tell you.
What is an HSG?
An HSG is an X-ray procedure used to view the inside of the uterus and the fallopian tubes. During the HSG test, a special contrast dye is injected through the cervix. As the dye flows, a doctor takes X-ray images to see if the dye moves freely through the tubes or if it gets stuck. If the dye flows through the tubes and spills into the pelvic cavity, it indicates the tubes are likely clear. If the dye is blocked or pools in a specific area, it suggests an obstruction or structural issue that may be hindering conception.
Can HSG Detect Endometriosis?
The short answer is no. An HSG cannot directly diagnose endometriosis.
Endometriosis occurs when tissue similar to the lining of the uterus grows outside the uterus, i.e. on the ovaries, pelvic side walls, or even the bowels. Because an HSG only looks at the inside of the reproductive organs (the “plumbing”), it cannot see the actual endometriosis lesions or implants.
However, there is a catch. While it cannot “see” or diagnose the disease, an HSG for endometriosis patients is still incredibly valuable because it can show the effects of the disease.
How HSG and Endometriosis Are Connected
You might be asking: okay, even though it cannot provide a definitive diagnosis, does an HSG show endometriosis indirectly? Sometimes. Doctors look for these “red flags” on your X-ray:
- Blocked Fallopian Tubes: Endometriosis often causes inflammation and scarring. If your HSG shows a blockage, it could be a sign that endometriosis has affected your tubes.
- Structural Abnormalities: The scarring (adhesions) from endometriosis can sometimes pull the uterus or tubes into “tilted” or unusual positions, which may show up on the X-ray.
- Hydrosalpinx: This is a specific type of tube blockage where the tube becomes dilated and filled with fluid, which is frequently associated with advanced endometriosis.
HSG vs. Other Tests: What Detects What?
Choosing the right diagnostic path depends on whether you are checking for tubal blockages, ovarian health, or active endometriosis lesions.
HSG assesses whether the fallopian tubes are open and may reveal tubal damage caused by the disease, ultrasound is useful for identifying ovarian endometriomas, and laparoscopy remains the gold standard as the only method that can definitively diagnose and surgically treat endometriosis lesions.
Why Your Doctor Might Order an HSG Anyway
Even if your doctor is 99% sure you have endometriosis-related infertility, they might still want an HSG. Why? Because knowing the status of your fallopian tubes is critical for planning your treatment.
If your tubes are open, you might be a candidate for IUI (Intrauterine Insemination). If they are severely blocked by endometriosis-related scarring, your doctor might recommend moving straight to IVF, especially Mini IVF which uses less medications and therefore reduces the risk of aggravating endometriosis symptoms.
Final Thoughts
While you should not rely on a hysterosalpingogram for endometriosis detection, it remains a vital piece of the fertility puzzle. It tells your medical team how the disease is affecting your internal anatomy, helping you build a clearer roadmap to parenthood.
Our fertility specialists can help you understand your options. Call us at (347) 970-8479 or book an appointment online.
Written by the New Hope Editorial Team
As experts in IVF and Assisted Reproductive Technologies, we are committed to educating and empowering people on their fertility journey with accurate information and compassionate care.