Why is it that tubal irrigation is not successful, but imaging says both fallopian tubes are unobstructed?

Patient's question:

No

Doctor's answer:

Hello, generally the false positive rate for diagnosing tubal patency through water infusion is relatively high. Contrast imaging results are more accurate, and the gold standard for determining whether fallopian tubes are open is laparoscopy. It is recommended to go to the hospital for a laparoscopic examination to confirm the diagnosis.