“Should we transfer the embryo now, or freeze it for later?”
If you’re going through IVF, this question almost always comes up: “Is a fresh embryo transfer better, or a frozen one?”
Not long ago, the answer was simple. If an embryo was ready, it was transferred immediately.
IVF has evolved.
Today, the decision is more nuanced—and more personalized than ever.
Why Has Frozen Embryo Transfer (FET) Become So Popular?
In recent years, many IVF clinics around the world have shifted toward a “freeze-all” strategy (freeze embryos first, transfer later).
So, what changed?
1. The Uterus Is More “Receptive”
During a fresh IVF cycle, your body is:
● under high hormonal stimulation
● influenced by ovarian stimulation medications
This can sometimes make the uterine lining (endometrium) less optimal for implantation
With frozen transfer:
● your body has time to recover
● hormone levels are more balanced
Result: A more natural and receptive uterine environment
2. Better Embryo Selection
Freezing embryos gives clinicians more time to:
● culture embryos to the blastocyst stage
● perform genetic testing (PGT) if needed
● use advanced tools like time-lapse monitoring and AI
In short: no rush decisions, just better selection.
3. Success Rates Are Often Higher
Multiple studies published in leading journals such as Fertility and Sterility and Human Reproduction have shown:
Frozen embryo transfers often result in similar or even higher pregnancy rates compared to fresh transfers in many patient groups.
This is especially true for:
● patients with high ovarian response
● women with PCOS
● those at risk of OHSS
4. Lower Risk of OHSS
One of the biggest concerns in fresh IVF cycles is:
Ovarian Hyperstimulation Syndrome (OHSS)
With a freeze-all approach:
● embryo transfer is postponed
● the body has time to stabilize
This significantly reduces medical risk.
Is Fresh Transfer Still a Good Option?
Yes, absolutely.
Fresh embryo transfer still has an important role in IVF.
Fresh transfer may be ideal if:
● hormone levels are well balanced
● only a moderate number of eggs are retrieved
● there is no risk of OHSS
● the endometrial lining looks optimal
In these cases:
● treatment is shorter
● results come faster
| Fresh vs Frozen: A Clear Comparison Factor | Fresh Transfer | Frozen Transfer (FET) |
| Treatment duration | Shorter | Longer |
| Uterine environment | May be affected by hormones | More natural |
| Embryo selection | Limited time | More advanced |
| Success rates | Good | Often higher |
| OHSS risk | Higher | Lower |
The Real Answer: “It Depends on You”
The old question was: “Which one is better?”
The modern question is: “Which one is better for YOU?”
Because IVF today is no longer one-size-fits-all. It’s personalized medicine.
A Real-Life Clinical Perspective
Patients often ask: “Doctor, what would you recommend if it were you?”
And the honest answer is:
● If everything looks perfectly balanced → fresh transfer can be a good option
● But if there is even a small concern → frozen transfer is usually the safer and smarter choice
DR.TÜLAY ÇAĞLAR, OBGYN
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Gynist IVF Clinic in Turkiye-İstanbul
Vali Konağı Caddesi.129 Milas Apartmanı Kat 5 Daire 13, 34363 Şişli/İstanbul
gynistivfclinic.com
https://www.instagram.com/gynistivfclinic/
+90 537 615 36 10
info@tulaycaglar.com