IVF MOCK TRANSFER

A mock transfer (sometimes called a trial transfer) is a quick, simple procedure done before your actual embryo transfer to help your doctor map out the best way to place the embryo safely and accurately.

The Purpose of a Mock Transfer

The uterus is unique to each person — its size, shape, and the angle of the cervix can all vary. During a mock transfer, your care team practices inserting the thin catheter (the same one used for the real transfer) to:

• Measure the depth and direction of your uterus.

• Identify any curves, scar tissue, or resistance that might make the actual transfer more challenging.

• Determine which catheter type and technique will work best for you.

All of this helps ensure that on transfer day, everything goes smoothly and quickly, minimizing stress and improving the chance of successful embryo placement.

What to Expect

• The mock transfer usually happens during your IVF prep phase — either before egg retrieval or during a cycle in which no embryos are being transferred.

• It’s done in the clinic, no anesthesia required.

• A speculum is inserted (like during a Pap test), and a thin, soft catheter is gently guided through the cervix into the uterus.

• The doctor measures the uterine length and notes any findings.

• The whole process takes just a few minutes, and you can resume normal activities right afterward.

• It is typically not painful.

Why do a Mock Transfer?

While it might seem like a small step, studies show that performing a mock transfer can reduce complications and increase the success rate of the real transfer, especially for first-time IVF patients. While it might be disappointing that you’re not transferring as soon as you’re able, a mock transfer can be beneficial. 

When does a transfer happen post mock transfer? 

A mock transfer is often done in a separate cycle before your actual embryo transfer — sometimes the month before, sometimes earlier in the IVF process (even before egg retrieval).

The timing depends on your clinic’s workflow and what else is happening in your treatment plan:

• If you’re doing a fresh transfer (right after egg retrieval):
  The mock transfer is usually done before retrieval so your doctor already knows the uterine depth and pathway when it’s time to transfer.

• If you’re doing a frozen transfer (FET):
  The mock transfer can happen in a prior cycle to collect the measurements, and then you’ll start your FET prep (natural or medicated) the next month or later — whenever you and your doctor are ready.

• If you’re doing an ERA (Endometrial Receptivity Analysis) cycle:
  Some clinics combine the mock transfer with the ERA biopsy cycle since both involve preparing the uterus and placing instruments through the cervix.

Your actual embryo transfer may happen the next month if your doctor gives the green light, or a bit later depending on how your body and schedule align.

The content presented on Labour the App (whether text, graphics, images, or other material) is provided “as is” and is offered for informational purposes only. The content provided on the App is not intended to be a substitute for professional medical advice, diagnosis, or treatment. You should always seek the advice of your physician or other qualified health provider. For more information, please refer to our Medical Disclaimer and to our Terms of Use.