Short answer: two unexplained failures is the point where you ask for a hysteroscopy, a full review of both embryology reports, and a conversation about PGT-A or ERA testing — these aren’t offered automatically in a standard first-round workup, so you may need to request them directly.
Why “unexplained” often isn’t actually unexplained
A failed cycle without a clear reason doesn’t necessarily mean there’s nothing to find — it often means the standard workup didn’t look at the right thing yet. PGT-A, sperm DNA fragmentation testing, ERA, EMMA/ALICE, and immunological testing are not part of a standard IVF workup — they’re specifically for cases like yours, after repeated failure, and typically have to be requested rather than happening by default.
The three things worth asking for directly
The embryology report from both cycles. Ask specifically for embryo grading, and whether the embryos were already tested with PGT-A. If they weren’t, chromosomal quality is a real unknown rather than a ruled-out cause. If they were tested and euploid (chromosomally normal) embryos still failed, that shifts the likely explanation toward the uterus or implantation rather than the embryo itself.
A hysteroscopy. This is regularly recommended after two failed cycles specifically to check for polyps, scarring, or chronic inflammation in the uterus — issues that don’t always show up on a standard ultrasound.
PGT-A or ERA, depending on your case. These check different things and are done in different cycles, so your clinic should explain why they’d recommend one over the other for you specifically:
- PGT-A biopsies the embryo during an IVF cycle to check its chromosomes — relevant if embryo quality hasn’t already been ruled out.
- ERA is a mock cycle with a biopsy at your usual transfer timing, checking whether the endometrium is receptive, pre-receptive, or post-receptive at that point. Studies cited by fertility clinics suggest 20-30% of patients with repeated failed transfers have a displaced implantation window — though independent evidence on how much ERA-guided timing actually improves outcomes is less settled, so treat it as one option to discuss, not a guaranteed fix.
There’s no single correct order — some clinics run PGT-A first on the assumption that embryo quality is the likelier issue; others, especially for patients under 38, often run ERA first. Ask your clinic which they’d choose and why, rather than assuming either is automatically the next step.
Other details worth having in hand
Progesterone level and endometrial thickness on each transfer day, and your TSH and vitamin D results if they were checked — these are the kind of specific data points a second opinion would want to review, and having them ready saves a round of back-and-forth if you do seek one.
Getting Started
Ask your current clinic for the embryology reports and a clear explanation of what they’d test next and why — and if the answers stay vague, a second opinion is a reasonable next step, not an overreaction. See verified IVF clinics in Spain, or ask our AI assistant to help think through which test might matter most for your specific case.
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