Fallopian-tube patency: examination and importance for fertility

This article answers patients’ questions about fallopian-tube patency: examination and importance for fertility, while also guiding readers toward the next practical step.

Fallopian-tube patency refers to whether the fallopian tubes allow the egg and sperm to meet and the embryo to be transported to the uterus. If the fallopian tubes are blocked or damaged, natural conception and IUI have a low chance of success and IVF may be more suitable.

Why the fallopian tubes are important for fertility

The fallopian tubes connect the area of the ovary with the uterus and play a key role in natural conception. After ovulation, the fimbriae capture the egg and the fallopian tube moves it toward the uterus. It is usually in the fallopian tube that the egg meets the sperm and fertilisation occurs. The early embryo then travels to the uterine cavity, where it can implant.

If a fallopian tube is blocked, damaged or distended with fluid, natural conception may be difficult or impossible. The risk of ectopic pregnancy may also increase.

When to examine fallopian-tube patency

The examination makes sense after a longer period of unsuccessful attempts to conceive, after pelvic inflammatory disease, after operations, with endometriosis, or after an ectopic pregnancy.

For women over 35 or after a longer period of trying to conceive, it is important not to delay diagnostics. If the fallopian tubes are blocked, repeating less effective methods can mean losing valuable time.

What is HyCoSy

Fallopian-tube patency is most commonly diagnosed using an ultrasound examination with contrast medium (HyCoSy). The doctor introduces a thin catheter through the cervix, applies the contrast medium into the uterine cavity, and uses ultrasound to observe whether it passes through the fallopian tubes into the abdominal cavity.

The advantage is that this is an outpatient examination that does not require surgery. The patient may feel pressure or cramps similar to menstruation. The result helps determine whether it makes sense to continue trying naturally or whether IVF would be more suitable.

What a blocked fallopian tube means

A blockage may be unilateral or bilateral. If at least one fallopian tube is patent and ovulation is occurring, natural conception may still be possible, but this depends on other factors. With bilateral blockage, the natural route is significantly restricted and IVF is often the most effective solution.

It is important to distinguish simple blockage from hydrosalpinx, meaning a fallopian tube distended with fluid. Hydrosalpinx can negatively affect embryo implantation and is sometimes treated surgically before IVF.

Fallopian-tube patency, IUI and IVF

IUI makes sense only if at least one fallopian tube is patent, ovulation is occurring and the semen analysis is suitable. With blocked fallopian tubes, IUI cannot bypass the problem because fertilisation still needs to occur in the fallopian tube.

IVF bypasses the fallopian tubes. Eggs are retrieved from the ovaries, fertilised in the laboratory and the embryo is transferred directly into the uterus. IVF is therefore often more appropriate in cases of tubal-factor infertility, especially with bilateral blockage or damage to the fallopian tubes.

How the result fits into the overall diagnostics

Fallopian-tube patency is only one component of fertility. The doctor evaluates it together with age, AMH, ovulation, the condition of the uterus, semen analysis and the length of time spent trying to conceive. The aim is not to perform every possible examination, but to quickly determine which route offers the best balance of chance, time and burden.

FAQ

What does fallopian-tube patency mean?

Patent fallopian tubes mean that the tubes allow the movement of the egg, sperm and early embryo as part of the natural conception process. After ovulation, the egg is captured by the fimbriae of the fallopian tube and travels through the tube toward the uterus. Sperm, on the other hand, move after intercourse from the vagina through the cervix and uterine cavity into the fallopian tube, where fertilisation usually occurs.

If fertilisation occurs, the early embryo then travels through the fallopian tube to the uterus over several days, where it can implant in the lining. Fallopian-tube patency is therefore important both for natural conception and for the correct transport of the embryo to the uterus.

Is HyCoSy painful?

HyCoSy is usually not significantly painful, but it can be uncomfortable. Some women feel pressure in the lower abdomen. The examination is performed on an outpatient basis, without surgery and without general anaesthesia.

Can I become pregnant with one blocked fallopian tube?

Yes, if the other fallopian tube is functional, ovulation is occurring and there are no other major factors.

When is IVF more suitable?

IVF may be a more suitable option particularly if both fallopian tubes are blocked or damaged, or if hydrosalpinx (fluid in the fallopian tube) is present. In these situations, the egg and sperm may not be able to meet naturally in the fallopian tube, or transport of the early embryo to the uterus may be impaired.

IVF is also often considered in women of higher reproductive age, after a longer period of unsuccessful attempts to conceive, with reduced ovarian reserve, more severe male-factor infertility, or a combination of several causes. The advantage of IVF is that fertilisation takes place in an embryology laboratory and the embryo is then transferred directly to the uterus, so fallopian-tube patency is not necessary for fertilisation itself.