“No spillage” on a fallopian tube test means the dye or contrast fluid injected into your uterus did not flow through and exit the far end of the tube, suggesting a blockage somewhere along its length. The finding typically comes from a hysterosalpingography (HSG), the most common imaging test used to check whether fallopian tubes are open. While the result can be alarming, it does not always mean the tube is permanently blocked, and even when it is, there are several paths forward depending on where the obstruction sits and what caused it.
What Happens During the Test
An HSG involves threading a thin catheter through the cervix and into the uterus, then injecting a contrast medium (either oil-based or water-based) while taking X-ray images. In a normal result, the contrast fills the uterine cavity, travels through each fallopian tube, and “spills” freely from the fimbriated (open) end of the tube into the pelvic cavity. That spillage confirms the tube is patent, meaning open end to end. When contrast fills part of a tube but stops before reaching the exit, or never enters the tube at all, the radiologist reports no spillage on that side.
The test can show different patterns. Sometimes dye enters the tube but halts at a specific point. Other times the tube fills and balloons outward near the tip without any free spill, which can point to a fluid-filled condition called hydrosalpinx. Each pattern tells a different story about what is going on and where.
Proximal Versus Distal Blockage
The location of the obstruction matters a great deal for both prognosis and treatment. A proximal blockage occurs near the point where the tube connects to the uterus. In this case, the contrast medium does not visibly pass beyond the narrow isthmus section of the tube. A distal blockage, by contrast, occurs closer to the ovary end. The dye may travel most of the length of the tube but fails to pass beyond the ampullary segment and out through the fimbriae, the finger-like projections at the tube’s tip.1PubMed Central. Incidence and Causes of Tubal Occlusion in Infertility: A Retrospective Cohort Study
Proximal blockages are more likely to be false alarms. Muscle spasm at the tubal opening can temporarily clamp the tube shut, mimicking an obstruction on X-ray. Distal blockages, on the other hand, are more often associated with real structural damage from past infection or inflammation and tend to carry more consequences for fertility.
How Often the Test Gets It Wrong
One of the most important things to know about a “no spillage” result is that it is not always right. HSG has a well-documented false-positive rate for proximal blockage. In one study comparing HSG results to what surgeons actually found during laparoscopy, about 39% of tubes diagnosed as blocked at the proximal end on HSG turned out to be completely normal when checked surgically.2PubMed Central. Hysterosalpingography in the workup of female infertility: indications, technique and diagnostic findings That is a substantial error rate, and it is driven largely by the tubal spasm issue mentioned above. Temporary contraction of the muscle at the junction between the uterus and the tube can completely block dye flow for the few seconds the image is captured, making an open tube look sealed shut.
This is why doctors often recommend a repeat HSG or a follow-up test before jumping to conclusions about a proximal blockage. Some clinics will administer an antispasmodic medication before the second attempt to relax the tubal musculature and reduce the chance of another false positive.
Newer ultrasound-based alternatives like hysterosalpingo-foam sonography (HyFoSy) are sometimes used as a less invasive first step. HyFoSy shows strong agreement with HSG overall, around 85% concordance, but the two tests are not perfectly interchangeable. HyFoSy tends to overestimate patency, particularly in women with a retroverted uterus, meaning it can miss some real blockages that HSG would catch.3Polish Journal of Radiology. Diagnostic performance of HyFoSy versus HSG for tubal patency: accuracy and agreement analysis A meta-analysis found that HyFoSy’s sensitivity compared with laparoscopy was about 75%, with specificity around 70%.4PubMed. Diagnostic accuracy of hysterosalpingo-foam sonography for assessment of fallopian tube patency in infertile women Laparoscopy with dye testing remains the gold standard when a definitive answer is needed, but it requires general anesthesia and carries surgical risks, so it is typically reserved for cases where less invasive tests leave genuine uncertainty or where surgical treatment is planned at the same time.
What Causes Fallopian Tubes to Block
The leading cause of tubal blockage is infection, and the most common culprit is Chlamydia trachomatis, sometimes joined by Neisseria gonorrhoeae. These sexually transmitted infections can trigger pelvic inflammatory disease (PID), which inflames the delicate lining of the fallopian tubes and, as it heals, leaves behind scar tissue and adhesions that narrow or seal the tube.5PubMed. Tubal factor infertility, with special regard to chlamydial salpingitis One frustrating aspect of this process is the time lag: chlamydia infections are often silent, causing no noticeable symptoms, so the damage accumulates without warning. Many women learn about past tubal damage only when they begin trying to conceive.
The link between chlamydia and tubal damage is well-established across large studies. Women who tested positive for chlamydia faced roughly double the risk of PID and nearly double the risk of infertility compared with women who tested negative.6PubMed Central. Chlamydia trachomatis and the Risk of Pelvic Inflammatory Disease, Ectopic Pregnancy, and Female Infertility: A Retrospective Cohort Study Among Primary Care Patients The risk climbs with repeated infections. A Dutch cohort study found that chlamydia positivity was associated with roughly a fourfold higher risk of tubal factor infertility specifically.7Sexually Transmitted Infections. Relation between Chlamydia trachomatis infection and pelvic inflammatory disease, ectopic pregnancy and tubal factor infertility in a Dutch cohort of women previously tested for chlamydia in a chlamydia screening trial
Beyond infection, other causes of tubal blockage include endometriosis, previous pelvic or abdominal surgery (which can leave adhesions), and, less commonly, congenital abnormalities. Endometriosis can distort pelvic anatomy and cause adhesions that kink or seal tubes from the outside, even when the inner lining is undamaged.
When No Spillage Means Hydrosalpinx
A particular pattern worth understanding is when the tube fills with contrast and visibly balloons or distends near the tip, but no dye escapes. This often signals a hydrosalpinx: a tube that has become sealed at the distal end and filled with fluid. The condition develops after infection or inflammation damages the fimbriae and causes them to fuse shut. Fluid secreted by the tubal lining, driven by ion transport across epithelial cells, accumulates because it has nowhere to drain.8PubMed Central. Effects of Hydrosalpinx on Endometrial Implantation Failures: Evaluating Salpingectomy in Women Undergoing in vitro fertilization
Hydrosalpinx is not just a passive blockage. It actively undermines fertility even when the other tube is open and even during IVF. Compiled data from multiple studies show that having a hydrosalpinx cuts the probability of achieving pregnancy through IVF roughly in half and doubles the miscarriage rate.9Human Reproduction Update. The influence of hydrosalpinx on IVF and embryo transfer: a review The fluid itself appears to be toxic to embryos and may wash back into the uterine cavity, disrupting implantation.10PubMed. The significance of hydrosalpinx in in vitro fertilization This is why fertility specialists take hydrosalpinx seriously even if IVF is planned and the tube itself is no longer needed for natural conception.
A recent network meta-analysis found that removing the affected tube (salpingectomy) before IVF more than quadrupled the ongoing pregnancy rate compared with leaving the hydrosalpinx untreated. Ultrasound-guided aspiration of the fluid also helped, roughly tripling ongoing pregnancy rates, though salpingectomy ranked highest overall. Tubal ligation, which seals off the damaged tube without removing it, also showed strong results for clinical pregnancy rates.11PubMed Central. Hydrosalpinx treatment before in-vitro fertilization: systematic review and network meta-analysis Both salpingectomy and tubal ligation have been shown to improve IVF outcomes in women with hydrosalpinx.12PubMed Central. Comparison of salpingectomy and tubal occlusion for hydrosalpinx in in-vitro fertilization outcome
When Only One Tube Is Blocked
A “no spillage” finding on one side, with normal spillage on the other, is a common scenario. Many women worry that one blocked tube means they cannot conceive naturally, but that is not the case. You only need one functional tube to become pregnant, because eggs can be picked up from either ovary by the open tube (though the tube on the same side as the ovulating ovary has the best chance of capturing the egg). Natural conception rates are lower with one tube than with two, but pregnancy is far from impossible.
The picture changes if the blocked tube has a hydrosalpinx, because the toxic fluid can reduce your chances even with one open tube. In one series of 25 women with one open tube and one hydrosalpinx, removing or tying off the damaged tube led to pregnancy in 88% of cases without needing IVF. Women who had a salpingectomy tended to conceive faster than those who had tubal ligation.13Medical Case Studies. Interventions in women with one blocked oviduct, lessons learnt and recommendations: A case report This is a small study, so the exact numbers should be taken cautiously, but the overall message aligns with larger evidence: dealing with the hydrosalpinx can restore natural fertility when the other tube is healthy.
Treatment Options Based on Blockage Location
What your doctor recommends after a confirmed “no spillage” result depends heavily on where the blockage is and how much damage is present.
For proximal blockages, fallopian tube catheterization has largely replaced surgery. The procedure uses a catheter and guide wire system, threaded through the uterus and into the tube under imaging guidance, to physically clear the obstruction. It works in the majority of cases, with success rates between roughly 71% and 92%.14PubMed. A review of selective salpingography and fallopian tube catheterization It is a minimally invasive procedure that interventional radiologists can perform relatively quickly.15PubMed Central. Fallopian tube catheterization Because many proximal blockages turn out to be caused by debris, mucus plugs, or mild scarring rather than dense fibrosis, catheterization can physically push through them.
Distal blockages are harder to fix. Surgical repair (neosalpingostomy, which involves creating a new opening at the tube’s tip) can be done laparoscopically, but results vary sharply depending on the severity of damage. A large case series of 434 women who underwent laparoscopic surgery for distal tubal blockage found that the five-year delivery rate was 37% overall. But the range was wide: women with mild damage (stage 1) had a 53% delivery rate, while those with severe damage (stage 4) had only about 23%. Factors like prior ectopic pregnancy, severe adhesions, and positive chlamydia antibodies all worsened the outlook.16PubMed. Laparoscopic surgery for distal tubal occlusions: lessons learned from a historical series of 434 cases
When both tubes are blocked and repair is not feasible or has failed, IVF is the recommended path. IVF bypasses the tubes entirely by retrieving eggs directly from the ovaries and fertilizing them in a lab before transferring the embryo to the uterus.17JAMA. Diagnosis and Management of Infertility: A Review Interestingly, fertilization rates in the lab tend to be high for women whose infertility is due to tubal blockage, since their egg and embryo quality may be completely normal.18PubMed. The relationship of tubal blockage, infertility of unknown cause, suspected male infertility, and endometriosis to success of in vitro fertilization and embryo transfer
The Surprising Fertility Boost From the Test Itself
Here is something that catches most people off guard: the HSG test itself can improve your chances of getting pregnant in the months that follow, particularly when oil-based contrast is used. This is not just anecdotal. A meta-analysis found that oil-based contrast increased clinical pregnancy rates by about 29% compared with water-based contrast, and live birth rates went up by roughly 41%.19PubMed Central. Comparison of fertility outcomes between oil‑based and water‑based contrast media during hysterosalpingography: A meta‑analysis A separate meta-analysis found similar results, with the oil-based group showing significantly higher pregnancy odds.20PubMed Central. A meta-analysis of fertility and adverse outcomes in oil- and water-based contrast for hysterosalpingography
The exact mechanism is still debated. The leading theory is that the oil-based dye may flush out minor debris or thin mucus plugs, or that it creates a more favorable environment in the tubes and uterine lining in the weeks following the test. Some researchers speculate an immune-modulating effect. Whatever the reason, the therapeutic effect is real enough that some fertility clinics specifically choose oil-based contrast when performing HSG, treating the diagnostic test as a low-cost intervention at the same time.21PubMed. Safety of oil-based contrast medium for hysterosalpingography: a systematic review
This also means that if your HSG showed no spillage and your doctor recommends repeating the test, there is a chance the repeat itself could improve things, either by revealing that the first result was a false positive or by physically opening a marginally obstructed tube.
Managing Pain During and After HSG
For many women, the practical question looming largest is how much the test hurts, especially if they need a repeat. Pain during HSG varies widely from person to person, but it is consistently reported as the most feared aspect of the procedure. A Cochrane systematic review found that topical anesthetics applied to the cervix can reduce pain during the procedure, and locally injected anesthetics had an even larger effect.22PubMed Central. Pain relief in hysterosalpingography
A randomized trial comparing different approaches found that the combination of an NSAID (like naproxen) taken beforehand plus lidocaine applied to the cervix provided the most effective relief.23PubMed Central. Comparison of four different pain relief methods during hysterosalpingography: a randomized controlled study If you have an HSG scheduled and are anxious about pain, it is worth asking your clinic about their pain management protocol. Not all clinics routinely offer cervical anesthesia, but the evidence supports requesting it. Cramping after the procedure is common and usually resolves within a day, often managed with over-the-counter pain relief.
When No Spillage Appears on Both Sides
Bilateral blockage, meaning no spillage from either tube, is the more serious scenario. If confirmed, natural conception is essentially not possible because there is no pathway for egg and sperm to meet. But “confirmed” is the key word. Given HSG’s false-positive rate for proximal blockage, bilateral no-spillage results deserve particularly careful follow-up before concluding that both tubes are truly closed. Your doctor may recommend a repeat HSG with antispasmodic premedication, a different imaging modality, or a laparoscopy to visually inspect the tubes and test them with dye under direct observation.
If bilateral blockage is confirmed and the obstruction is proximal on both sides, catheterization can be attempted on each tube. If the blockage is distal on both sides with significant damage, or if catheterization or surgery has failed, IVF becomes the clear next step. The encouraging news is that tubal factor infertility, in isolation, does not impair egg quality or embryo development. Women with bilateral tubal blockage who undergo IVF tend to have good fertilization rates, and many go on to achieve successful pregnancies once the tubes are bypassed entirely.