Hysterosalpingo-contrast-sonography (usually shortened to HyCoSy) is a simple ultrasound procedure used to examine the fallopian tubes, as well as detect any problems of the uterus and endometrium. The test requires the use of a contrast fluid to visualise the fallopian tubes. Some women will require the use of a non-iodinated contrast agent called ExEm Foam. The HyCoSy procedure is a safe and reliable alternative to the conventional hysterosalpingogram (HSG) which uses X-rays. No radiation or iodinated contrast material is used for a HyCoSy test.