HSG Test Report: Tubes Open or Blocked, and What It Means
An HSG report answers one question: did the dye pass through each fallopian tube, or did it stop? The test uses a contrast fluid and X-ray imaging to show whether it flows through the tubes, so each tube gets its own reading. Start with the summary line, then check the tube-by-tube lines beneath it.
The short version
- What it checks: whether contrast dye flows through each fallopian tube.
- Open or patent: the dye passed through the tube and spilled into the pelvis.
- Blocked or occluded: the dye stopped, and no spill was seen from that side.
- Read per side: one tube can read open while the other reads blocked.
- Quotable line: spill means that tube let the dye through, and no spill is a reading to confirm, not a final verdict.
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What do the tube lines on an HSG report say?
Each tube line is a short description of one side, so two sides mean two separate answers. A 2016 paper on contrast spread during hysterosalpingography, by Bhoil and colleagues in the Polish Journal of Radiology, reads free spill from a tube as a sign that the tube is patent, meaning open. Its figures include one example with spill from the right tube and none from the left, and a blocked example with no spill on either side, which its legend calls bilateral tubal blockage. So read each side on its own, then check whether the summary agrees with both sides and mentions every side.
| Wording you may see | What it usually means | Question to ask |
|---|---|---|
| Spill on both sides | Dye passed through both tubes | Does the summary match the findings? |
| Spill on one side only | One tube passed the dye; the other showed no spill | Which side, and what is planned? |
| No spill on either side | Both tubes read as blocked on this scan | Would the team confirm this another way? |
How do you read an HSG report in the right order?
- Find the summary line, often called the impression, and note what it says for each side.
- Read the tube lines side by side. Check whether spill was seen on both sides or on only one.
- Read the uterine cavity line next. The 2016 paper notes that spill also gives an idea about the uterine contour, so the shape of the womb and the tube lines belong together.
- Check the summary against the tube lines. If they do not match, write that down as a question for the clinic.
- Write two or three questions you want answered before the follow-up visit.
What can an HSG result settle, and what can it not?
The Cochrane review CD014968 compared imaging tests for blocked fallopian tubes, including HSG, sono-HSG and transvaginal hydrolaparoscopy (THL). Its reference standard was laparoscopy with methylene blue dye, and its authors concluded that sono-HSG, HSG and THL are all reliable tests for blockage on both sides. That conclusion matters, because it shows HSG is a reliable test with a known weak spot. The review also found that weak spot in HSG: it “seems to suggest blockage of the tubes when there is none more often than sono-HSG and THL.”
A blocked reading is a question, not an answer. If the result will shape a decision, ask the clinic whether they would confirm it with laparoscopy and dye, since the review used that method as its benchmark.
When in the cycle is an HSG usually done?
Timing matters. According to the 2016 Bhoil paper, HSG should be scheduled between the end of menstruation and before ovulation, because that is when pregnancy is least likely. Confirm the exact day with the clinic when you book, since the timing is part of the plan they give you.
The question that clears up the summary
At the follow-up, ask: “Was spill seen on both sides, and does the summary match the tube lines?” Then ask which side the team is most concerned about. Ask it directly. Those two answers tell you more than the summary line does by itself. Write both answers down. Bring them to the next visit.
What should you bring to the fertility clinic?
- The full report, not only the summary line.
- Your list of questions, starting with which side showed spill.
- Any past pelvic infection or pelvic surgery, with a question about whether it changes how the result should be read.
- A current list of your medicines, so the team can review it with you.
For related reading, the AMH test report and egg reserve guide covers the hormone reading, the pelvic ultrasound report guide covers the uterus and ovary scan words, and the PCOS and PCOD tests guide covers another common fertility question, and more report guides sit in Lab Reports Decoded.
A blocked tube on HSG is a finding to discuss with the fertility team, because HSG can suggest blockage when none is there. Get medical help promptly for fever, severe lower belly pain or heavy bleeding after the test. Do not start, stop or change any medicine because of a report; the doctor decides that.
Questions people ask about HSG test reports
What does an HSG test report mean?
It says whether contrast dye flowed through each fallopian tube. Spill into the pelvis means that tube was open on that side, and no spill means the report reads that side as blocked.
What does “tubes open” or “patent” mean on an HSG?
Patent means the dye went through the tube and spilled into the pelvis, which the 2016 Bhoil paper reads as a sign the tube is open. Check that the summary line matches the tube-by-tube lines.
Can an HSG show a blocked tube that is actually open?
Yes. The Cochrane review says HSG seems to suggest blockage when there is none more often than sono-HSG and THL, so a blocked reading is worth confirming when it matters.
What if spill is seen on one side only?
It means the report sees dye leaving one tube and not the other. Each side is read separately, so ask which side showed spill and what the team plans for the other.
Is an HSG test reliable?
The Cochrane authors concluded that HSG, sono-HSG and THL are all reliable tests for blockage on both sides. They also found that HSG seems to suggest blockage when there is none more often than sono-HSG and THL. So reliable here means useful for the question, not perfect, and a blocked result deserves a second look before anyone plans around it.
Is HSG the same as laparoscopy with dye?
No. Laparoscopy with methylene blue dye is the reference standard that the Cochrane review measured imaging tests against. HSG is an X-ray test that tracks contrast flow, and the clinic chooses which check to use.
When is an HSG test done in the cycle?
Between the end of the period and before ovulation, according to the 2016 Bhoil paper, because pregnancy is least likely then. Your clinic confirms the exact day.
Does the uterine cavity line change the reading?
The uterine cavity line describes the shape of the womb, and it is read alongside the tube lines. The 2016 paper notes that spill also gives an idea about the uterine contour, so ask about anything that is unclear.
Should the clinic be told about past pelvic infection or surgery?
Yes. Mention it at the consultation and ask whether it changes how the result should be read.
Bottom line
Spill on a side means that tube passed the dye. No spill on a side means the report calls it blocked. Both rules are simple, and only the second one needs a second look. The Cochrane review found that HSG can make an open tube look blocked, so the report starts a conversation with the fertility team rather than settling the question.
Quotable line: Spill means the tube let the dye through, while no spill is a reading to confirm, not a final verdict.