Blocked Fallopian Tubes on HSG or HyFoSy: Does It Always Mean Infertility?

Being told that your fallopian tubes are "blocked" can be very worrying. However, an HSG (hysterosalpingography) or a HyFoSy (hysterosalpingo-foam sonography) result does not always mean that there is a true blockage.

Before considering surgery or in vitro fertilization (IVF), it is essential to interpret the findings in the context of your individual medical history.

How reliable are HSG and HyFoSy?

HSG and HyFoSy are the standard tests used to assess whether the fallopian tubes are open.

Their accuracy is excellent, but no test is perfect. In particular, when a blockage appears to be located in the proximal part of the tube (close to the uterus), studies have shown that 20–40% of these findings may be false positives, usually caused by a temporary tubal spasm rather than a true obstruction.

Why can a tube appear blocked when it is actually open?

The most common reasons include:

• Temporary tubal spasm during the examination

• A temporary mucus plug or cellular debris

• Technical difficulties during the injection of the contrast medium

  
  

What are the true causes of tubal blockage?

The most common causes are:

• Previous pelvic inflammatory disease (especially infection with Chlamydia trachomatis)

• Endometriosis

• Adhesions following abdominal or pelvic surgery

• Hydrosalpinx (fluid-filled fallopian tube)

• Less commonly, congenital abnormalities or other tubal diseases

  
  

When should a false-positive result be considered?

The result should be interpreted cautiously if:

• You are young.

• Your pelvic ultrasound is normal.

• You have never had pelvic inflammatory disease, endometriosis, or pelvic surgery.

• Only one tube appears blocked, and the blockage is located near the uterus (proximal obstruction).

In these situations, repeating the HSG or HyFoSy may be preferable before concluding that there is a permanent blockage.

Can tubal flushing ("hydrotubation") unblock the tubes?

No. Scientific studies have not shown that repeated tubal flushing reliably restores tubal patency or improves long-term fertility. Therefore, it is not routinely recommended as a fertility treatment.

When is laparoscopy necessary?

Laparoscopy may be appropriate when there is strong suspicion of genuine tubal disease, for example in the presence of:

• Hydrosalpinx visible on ultrasound

• Endometriosis

• A history of severe pelvic infection

• Previous abdominal or pelvic surgery

• Pelvic pain or suspected adhesions

Laparoscopy is a surgical procedure performed under general anesthesia. Like any operation, it carries risks, including infection, bleeding, injury to surrounding organs, and the formation of new adhesions.

For this reason, it should not be performed solely to confirm an uncertain HSG or HyFoSy finding.

Why avoid unnecessary surgery in young women?

Even if a blocked tube is successfully reopened, it may become blocked again or fail to regain normal function. In addition, surgery itself can lead to the formation of new adhesions.

In young women with a good ovarian reserve, it is often wiser to confirm the diagnosis before considering surgery.

What about women over the age of 35?

From the age of 35—and especially after 38—time becomes an increasingly important factor in fertility.

Repeating multiple investigations or performing surgery with limited chances of success may delay more effective treatment.

Depending on the overall fertility evaluation, particularly in women with diminished ovarian reserve or significant tubal disease, in vitro fertilization (IVF) may provide a higher chance of pregnancy than tubal surgery.

Key Takeaways

A finding of blocked fallopian tubes on HSG or HyFoSy does not automatically mean that natural pregnancy is impossible.

The results should always be interpreted in the context of your age, medical history, pelvic ultrasound findings, ovarian reserve, and the complete fertility assessment.

Before proceeding with surgery or IVF, confirming the diagnosis may sometimes be the best approach. This can help avoid unnecessary surgery in some women—or, conversely, prevent the loss of valuable time when every month matters.

Take good care of yourself!

Kind regards,

Dr. Sandra Yene Amougui