Transfer catheter and ultrasound-guided transfer

A transfer catheter is a thin, flexible tube used to carry an embryo, in a small amount of fluid, through the cervix and into the uterine cavity during embryo transfer. Most transfers are performed under ultrasound guidance, using real-time abdominal ultrasound imaging so the clinician can see the catheter's position and place the embryo at an appropriate point in the uterine cavity; this requires a comfortably full bladder to improve the ultrasound view. Occasionally, passing the catheter can be more difficult, for example because of the shape of the cervix or uterus. When this is anticipated, the clinical team may first carry out a mock embryo transfer, a trial run of the procedure without an embryo, to assess the cervical canal and uterine cavity and plan for the real transfer in advance.

Also known as: embryo transfer catheter, ultrasound-guided embryo transfer, mock embryo transfer, trial embryo transfer

Last reviewed: 9 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.