How Long Does IVF Frozen Embryo Transfer Take?

Curious about how long a frozen embryo transfer takes? Discover the full embryo transfer timeline and the frozen embryo transfer process step-by-step for patients in the UK.

What Is a Frozen Embryo Transfer (FET)?

A frozen embryo transfer (FET) is a crucial part of many IVF journeys. It involves thawing and transferring a previously frozen embryo into the uterus to try and achieve pregnancy.

Many patients opt for FET as part of their fertility treatment plan—either after a successful egg collection cycle, or after a previous fresh cycle.

While it may sound straightforward, there’s more to the process than simply picking a date and transferring the embryo. The embryo transfer timeline can vary slightly depending on your body’s response and the treatment protocol chosen by you and your Fertility Consultant.

So, how long does it actually take?

Let’s break it down.

Embryo Transfer Timeline: At a Glance

The average embryo transfer timeline for a frozen cycle typically spans 4 to 6 weeks from the start of treatment to the day of embryo transfer. This can vary slightly depending on whether you're using a natural or medicated cycle, as well as other individual medical factors.

Here’s a simplified overview:

Let’s now explore the frozen embryo transfer process step-by-step in more detail.

Frozen Embryo Transfer Process: Step-by-Step

There are two main approaches to a frozen embryo transfer: natural cycle and medicated cycle. Your consultant will choose the best method depending on your cycle regularity, hormone levels, and medical history.

Step 1: Consultation and Cycle Planning

Your fertility consultant will review your medical notes and previous IVF cycle to prepare a treatment plan. This is the time when you’ll discuss:

• Your ideal transfer date
  

• Blood tests or scans
  

• Type of FET protocol (natural vs. medicated)
  

• Endometrial lining targets
  
  

Once agreed, you'll either wait for your next period (natural cycle) or begin medication straight away (medicated cycle).

Time: Week 0–1

Step 2: Cycle Monitoring and Endometrial Preparation

The next stage in the embryo transfer timeline is preparing your uterine lining (endometrium) to support embryo implantation.

In a Natural Cycle:

• Monitoring starts around day 10 of your menstrual cycle.
  

• You'll have regular ultrasound scans and possibly blood tests to track ovulation.
  

• The embryo transfer is timed based on natural ovulation—typically 5–6 days later.
  
  

In a Medicated Cycle:

• You start taking oestrogen (often tablets or patches) early in the cycle.
  

• After 10–14 days, a scan checks if the endometrium has thickened sufficiently.
  

• If it has, you’ll begin progesterone to mimic the natural post-ovulation hormone environment.
  

• The embryo is then transferred after 5–6 days of progesterone.
  
  

Time: Week 1–3

Step 3: Embryo Thawing and Transfer

On transfer day, the embryo is carefully thawed in the lab. Modern freezing techniques like vitrification have high embryo survival rates—over 95% in many UK clinics.

The embryo is then transferred into your uterus using a thin catheter. The procedure is quick (usually under 15 minutes) and painless, often done without anaesthetic.

You may be asked to come in with a full bladder, as it helps position the uterus correctly for ultrasound guidance.

Time: Week 4–5

Step 4: The Two-Week Wait and Pregnancy Test

After the embryo transfer, you'll continue taking progesterone to support early pregnancy. The next step is the much-anticipated 'two-week wait', when you monitor symptoms and wait for your blood test results.

The pregnancy test—typically a blood test measuring beta hCG levels—is done around 10–14 days after the embryo transfer.

This marks the end of the official embryo transfer timeline.

Time: Week 6–7

Factors That Can Affect the Embryo Transfer Timeline

While the average frozen embryo transfer takes around 4–6 weeks, a few factors may lengthen or shorten the process:

• Irregular menstrual cycles may delay natural monitoring.
  

• Endometrial issues, such as thin lining or polyps, may require additional treatment.
  

• Delayed ovulation in natural cycles may push back the transfer date.
  

• Clinic scheduling and lab availability can affect timing slightly.
  
  

Always stay in close contact with your fertility team, who will adapt your treatment based on real-time scan and blood test results. 

One of the benefits of choosing IVF Matters, is that Dr Koita is always available, any time via WhatsApp, to take your questions or concerns and respond with support and advice. 

Why Choose a Frozen Embryo Transfer?

Frozen embryo transfers are now more common than fresh transfers in many UK clinics.

Why?

• Higher success rates in some cases, as the body is more prepared.
  

• Less physical stress than a full IVF stimulation cycle.
  

• Embryo preservation allows for multiple attempts from one egg collection.
  

• More flexibility in timing and planning around life events or travel.
  
  

Tips for a Smooth FET Cycle

• Follow medication schedules exactly if using a medicated cycle.
  

• Attend all scans to ensure your body is responding as expected.
  

• Ask about add-ons like embryo glue or assisted hatching if recommended.
  

• Practice stress-reducing techniques—gentle exercise, meditation, and support groups can help.
  

Final Thoughts

The embryo transfer timeline for a frozen cycle generally lasts around 4 to 6 weeks from start to pregnancy test.

While it’s not a one-size-fits-all experience, understanding the frozen embryo transfer process step-by-step can give you clarity and control during a time that often feels uncertain.

With good preparation, clear communication with your specialist, and a little patience, you’ll be well on your way through the FET process—and hopefully, to a positive result and making your dreams come true. 

Would you like to discuss Frozen Embryo Transfer?

IVF Matters offers the opportunity for you to schedule a FREE Advisory Call with our Fertility Specialist, Dr Koita. To schedule an Advisory Call appointment at a time to suit you, click here.

View more information on Frozen Embryo Transfer>