Chromopertubation is a test used during surgery to check whether your fallopian tubes are open. A colored dye is injected through the cervix and into the uterus while a surgeon watches through a camera to see if the dye flows out through the ends of the fallopian tubes. If it does, the tubes are open (patent). If it doesn’t, one or both tubes may be blocked. The test is considered the gold standard for evaluating tubal patency and is most commonly performed during a laparoscopy that’s already scheduled for another reason.
How the Procedure Works
Chromopertubation is performed under general anesthesia as part of a laparoscopic surgery. A thin camera is inserted through a small incision near the navel, giving the surgeon a direct view of the uterus, fallopian tubes, and surrounding pelvic structures. Once the camera is in place, a dilute colored dye is injected through the cervix using a catheter.
The surgeon watches the fallopian tubes in real time. If a tube is open, the dye spills out from the fimbrial end (the finger-like opening near the ovary) into the pelvic cavity. If no dye passes through even with increasing pressure, that tube is considered blocked. Each tube can be assessed separately, so it’s possible to find one open tube and one blocked tube in the same patient. The volume of dye used typically ranges from 20 to 30 milliliters when injected through a catheter placed in the uterus.
Dyes Used in Chromopertubation
The two dyes used are methylene blue and indigo carmine, both of which produce a vivid blue color that’s easy to spot against pelvic tissue. Of the two, indigo carmine is generally preferred. Methylene blue is absorbed into cells and can generate a type of reactive oxygen when exposed to white light, which has the potential to damage cellular DNA. Indigo carmine stays on the surface of tissue without being absorbed and appears to be chemically stable under light, posing little risk to genetic material. Because their diagnostic effectiveness is considered equivalent, many surgeons default to indigo carmine.
When It’s Recommended
Chromopertubation is not a first-line test for infertility. The American Society for Reproductive Medicine does not recommend laparoscopy as a routine method for checking whether fallopian tubes are open. Less invasive options, like a hysterosalpingogram (HSG), which uses X-ray imaging and contrast dye injected through the cervix without surgery, are typically used first.
However, if a laparoscopy is already planned for another reason, such as investigating endometriosis, removing fibroids, or evaluating pelvic pain, chromopertubation is added to the procedure. It takes only a few extra minutes and provides a direct, real-time look at tubal function that imaging tests can’t fully replicate. It also lets the surgeon inspect the outside of the tubes and surrounding tissue for adhesions, endometriosis deposits, or other structural problems that could affect fertility but wouldn’t show up on an X-ray.
How It Compares to Other Tubal Tests
Laparoscopic chromopertubation is the reference standard that other tubal patency tests are measured against. An HSG, which is the most common non-surgical option, has a sensitivity of about 94.6% and a specificity of 84% when compared to chromopertubation. That means HSG is good at confirming open tubes but less reliable at correctly identifying blockages. It can sometimes suggest a blockage that isn’t actually there, particularly if a tube spasms during the test.
A newer ultrasound-based method called sonosalpingography performs slightly better than HSG, with about 97.3% sensitivity and 92% specificity relative to chromopertubation. Still, neither imaging test can match the direct visual confirmation that chromopertubation provides, nor can they reveal conditions like endometriosis or adhesions on the outer surfaces of the tubes.
The trade-off is that chromopertubation requires general anesthesia and surgery, while HSG and sonosalpingography are office-based procedures. For most women undergoing an initial fertility workup, the less invasive tests come first. Chromopertubation is reserved for situations where surgery is already warranted.
Risks and Side Effects
The risks of chromopertubation are primarily the risks of laparoscopic surgery itself: reactions to anesthesia, infection at the incision sites, and rare injury to surrounding organs. The dye adds a small additional layer of risk. A systematic review of reported cases found that allergy-like reactions to methylene blue during chromopertubation fall into two categories: true allergic reactions and a condition called methemoglobinemia, where the dye interferes with the blood’s ability to carry oxygen.
Among 13 documented cases of severe reactions, four were confirmed allergic reactions and six involved methemoglobinemia. Symptoms included skin changes, blue discoloration of body fluids (urine, sweat), respiratory difficulty, and drops in blood pressure. These reactions are rare but can be serious. The use of indigo carmine instead of methylene blue reduces this risk, since indigo carmine is considered non-allergenic and is not absorbed into cells the way methylene blue is.
Recovery After the Procedure
Because chromopertubation is done during a laparoscopy, recovery follows the typical laparoscopic timeline. Most women go home the same day, usually within three to four hours after waking from anesthesia. You can expect some lower abdominal pain and discomfort for the first few days. Shoulder pain is also common, caused by gas used to inflate the abdomen during surgery irritating the diaphragm.
Dressings over the small incisions can come off after about 24 hours, and a small amount of vaginal bleeding for one to two days is normal. Fatigue tends to be the most lingering symptom as your body heals. Light walking of 10 to 15 minutes is encouraged starting the day after surgery, gradually building to 30 to 60 minutes by midweek. Most women return to work within one week after a diagnostic laparoscopy. If more extensive surgical work was done at the same time, recovery extends to two or three weeks.
The dye itself may temporarily tint your urine blue or green for a day or so after the procedure. This is harmless and resolves on its own.