By the time patients come to us after two or three failed IVF cycles elsewhere, they're often emotionally exhausted, financially stretched, and starting to wonder whether anything will work. The temptation at this point — both for patients and for clinics — is to keep trying the same protocol with slight variations and hope.
That's almost always the wrong move. Three failed cycles is the moment to stop, take everything apart, and rebuild the plan. Here's how a thoughtful clinic should approach this.
The definition matters
"Recurrent implantation failure" doesn't have one universal definition, but the working definition most clinicians use:
Failure to achieve pregnancy after 2-3 transfers of good-quality embryos in a woman under 40 with no other obvious reason.
The qualifier "good-quality embryos" matters. If embryos were graded poorly, the failure is more likely an egg/sperm/embryo issue than an implantation issue — and the investigations are different.
The four categories of failure
When I review a recurrent failure case, I'm asking which of these is the most likely cause:
1. Embryo problem
Embryos look good morphologically but are genetically abnormal. Female age is the biggest driver — at 38, roughly 50% of embryos are chromosomally abnormal; at 42, around 80%. Genetic testing (PGT-A) can identify this. Sperm DNA fragmentation can also play a role.
2. Endometrial / receptivity problem
The lining isn't ready, isn't thick enough, or has timing issues. Polyps, fibroids, adenomyosis or undiagnosed endometritis can be silent contributors.
3. Immunological / thrombotic problem
Subset of cases involve immune-mediated rejection or clotting issues that prevent implantation or early pregnancy. Investigations include antiphospholipid antibodies, thrombophilia panel, and selected immune markers.
4. Process / protocol problem
The stimulation protocol wasn't right; the lab handled embryos sub-optimally; the transfer technique was off; timing was wrong. This is the most fixable category.
What we actually do
Step 1: Don't start another cycle immediately
The most important thing. Give us 2-3 weeks to do investigations and plan. Rushing into another attempt with the same protocol is likely to give the same result.
Step 2: Review every record from previous cycles
We want to see: hormonal blood reports, stimulation drug doses and schedule, scan reports through stimulation, embryology reports (how many eggs, fertilisation rate, embryo grading, day of transfer), lining thickness, transfer technique notes, post-transfer support.
This often reveals something the previous clinic didn't flag — undersized lining, suboptimal stimulation, poor embryo selection.
Step 3: Targeted investigations
- Hysteroscopy — a direct look inside the uterus. Reveals undiagnosed polyps, fibroids in the cavity, scar tissue, or chronic endometritis. Treatment is often done at the same sitting.
- Endometrial biopsy — for chronic endometritis (silent infection of the lining) — found in 20-30% of recurrent failure cases. Treated with a 2-week antibiotic course.
- Karyotyping for both partners — to rule out balanced translocations.
- Sperm DNA fragmentation — male contribution to repeated failure is often missed.
- Thrombophilia panel + selected immune markers — only if clinical suspicion.
- ERA (Endometrial Receptivity Array) — in select cases to confirm transfer timing.
Step 4: Rebuild the protocol
Based on findings, the next cycle is rarely "more of the same":
- Different stimulation drug profile if the response was poor
- Antagonist vs. agonist protocol switched if cycle synchronisation needs work
- Freeze-all approach if hormone levels were too high at trigger
- ICSI added or removed based on fertilisation rate
- Assisted hatching, embryo glue, or other lab adjuncts where evidence supports
- PGT-A if embryo aneuploidy is suspected
- Single embryo transfer if multiples risk is real
Step 5: Manage expectations honestly
If the cause is identified and addressed, success rates in the next cycle are often as high as a first cycle. If the cause is purely egg-quality at an advanced age, we have an honest conversation about whether more own-egg cycles make sense, or whether donor egg should be considered.
Red flag. If a clinic recommends a 4th cycle without changing anything from the previous three, get a second opinion. There should always be a documented reason to expect a different outcome.
The conversation about donor eggs (when to have it)
This is one of the hardest conversations in fertility medicine. We have it gently, after the alternatives have been honestly evaluated. For women over 42 with severely diminished reserve, donor egg success rates are dramatically higher than own-egg attempts — and the decision often comes down to whether the patient is psychologically ready, which can take time.
We respect every decision in this space. Donor egg, donor sperm, donor embryo, surrogacy, or stopping treatment — all are legitimate, and all are personal.
Emotional reality
Recurrent IVF failure is one of the most exhausting experiences in healthcare. There's no test or protocol that addresses the grief. What we try to do is hold the medical complexity AND the emotional reality at the same time — slow down when you need to, push when there's a clear next step, and never let you feel like a number.
If you've had failed cycles elsewhere and aren't sure where to go from here, the best next step is a sit-down review with someone who'll actually go through the previous reports. Bring everything — every old report, every prescription, every scan. We'll spend the time it deserves.
