The egg needs to meet the Male sperm to produce an embryo. The egg is picked up be Fallopian tubes which are thin 10 cms long tubes where the fertilisation takes place , which means that Fallopian tubes shouldn’t be blocked for pregnancy to happen.
The tubes can get blocked due to endometriosis, pelvic infection , fibroids, STD , history of uterine infection caused during abortion or miscarriage and ectopic pregnancy.
Most of the time blocked Fallopian tubes don’t cause any symptom and are diagnosed during fertility investigations which might suggest hydrosalpinx or blockage of tubes in the hystero salpingo grams .
Blocked tubes can be detected by hysterosalpingogran where a dye is injected in the cervix and the flow of which is captured using specialised imaging called fluoroscopy . It is slightly painful test and patients can choose to have it under anaesthesia which decreases the incidence of false positives.
Other tests may include ultrasound,laparoscopy and dye test .