Frozen Embryo Transfer (FET) 

Step 1a: Natural FET

In a natural frozen embryo transfer cycle (where no medications are used before the embryo transfer), the cycle is tracked for ovulation, using blood tests to monitor the hormone levels.  As ovulation draws near, an ultrasound is conducted to assess the growth and development of the endometrium (the lining of the uterus).  When this is suitable, the embryo thaw and transfer will be scheduled accordingly.  

Step 1b: Stimulated FET

In a stimulated frozen embryo transfer cycle, hormone medication is administered in order to promote the growth and development of the endometrium, ready for implantation. This can be done with conventional FSH hormones or using hormone replacement therapy (HRT).  Using ultrasound, the endometrium is monitored and when it is deemed suitable, a trigger injection is given to induce endometrial receptivity.  

Step 2: Embryo thaw 

The timing of your embryo thaw will be carefully calculated to ensure that your embryo is being transferred into your uterus when it is at its most receptive.      

Step 3: Embryo Transfer (ET)

The embryo transfer procedure in an FET cycle is no different from that during a conventional IVF or ICSI cycle.  The doctor will very gently insert a speculum into your vagina, and a fine, soft tube is then carefully  passed through the cervix allowing the embryo to be placed delicately into your uterus.

Step 4: Monitoring and support 

In the fortnight after your embryo transfer, your hormone levels will be monitored and supported using medication to ensure the environment remains ideal to sustain embryo implantation.  You must continue your medication until the outcome of your cycle is determined via a blood test.