Two or more pregnancy losses is the point where most doctors stop treating it as a one-off and start a structured evaluation. A single early miscarriage is common and usually a chance chromosomal event in that one pregnancy — it doesn't predict your next one. A repeating pattern is different: it's worth finding out why, because in a meaningful share of couples a specific, treatable cause is identified.

How many losses before it's "recurrent"?

Most clinics use two or more losses as the threshold to start testing; some wait for three. The losses don't need to be back-to-back pregnancies with nothing in between — a pattern across two or three losses, even with a healthy pregnancy somewhere in the mix, still counts and is still worth investigating if it recurs again.

What the evaluation actually checks

A recurrent pregnancy loss workup isn't one test — it's a panel, because the causes sit in several different systems:

  • Chromosomal testing of both partners — a blood test looking for a balanced chromosomal rearrangement in either partner. This is uncommon, but when present it changes the conversation toward options like PGT-SR on future embryos.
  • The shape of the uterine cavity — a fibroid, a polyp, scar tissue, or a uterine septum can all make it harder for a pregnancy to implant and grow. This is usually assessed with an ultrasound, and a hysteroscopy is added when the scan picture isn't clear enough on its own.
  • Hormonal and metabolic causes — thyroid function, blood sugar control, and prolactin are standard checks, since untreated abnormalities in any of these are linked to pregnancy loss.
  • Clotting and immune factors — antiphospholipid antibody syndrome (APLA) is the best-established of these; it's tested for with a specific blood panel, not assumed.
  • Genetic testing of the pregnancy tissue itself, when a loss happens during the workup — if the tissue shows a chromosomal abnormality, that loss is explained on its own and doesn't necessarily point to a parental cause.

Both partners are evaluated. This is never treated as a one-person diagnosis, since a cause can sit with either partner or with neither.

What gets found — and what doesn't

This is the part couples are rarely told clearly: in a large share of couples who go through the full workup, no single cause is identified. That is not a dead end, and it is not the same as there being nothing wrong — it means none of the known, testable causes explains this particular pattern. The evaluation still has value even then, because it rules out the things that would specifically change management (a clotting disorder needing blood thinners in the next pregnancy, a uterine abnormality needing surgical correction, a thyroid problem needing treatment before you try again).

When a cause is found, what happens next depends entirely on what it is:

  • A uterine cavity problem (polyp, septum, certain fibroids) is often treated surgically before the next attempt.
  • APLA syndrome is managed with specific medication started early in the next pregnancy.
  • A thyroid or metabolic imbalance is corrected and monitored before and during the next pregnancy.
  • A parental chromosomal rearrangement shifts the conversation toward genetic counselling and, in some cases, PGT-SR with IVF.

The outlook

Even when no cause is found, most couples who have had recurrent losses go on to have a successful pregnancy, particularly with closer monitoring in the first trimester of the next one. The honest framing is: a diagnosis changes what your doctor does differently next time; the absence of one doesn't mean there's nothing that can help — supportive, closely watched care in early pregnancy still meaningfully improves the picture for most couples.

Recurrent pregnancy loss calls for a plan, not just reassurance to try again. The workup exists to find what can be treated — and to tell you honestly when nothing specific is found, which is itself useful information.

How this differs from recurrent implantation failure

Recurrent implantation failure is a related but distinct pattern — good-quality embryos from IVF repeatedly failing to implant at all, rather than a confirmed pregnancy that is then lost. The two share some of the same tests (uterine cavity assessment, clotting and hormonal panels) but are evaluated and discussed somewhat differently with your fertility team. If you've had both patterns, mention that clearly, since it shapes which tests are prioritised.

Frequently asked

Is one miscarriage enough to be tested for recurrent pregnancy loss?

No. A single early miscarriage is common — most often a chance chromosomal error in that one embryo — and on its own doesn't usually prompt a full RPL workup. Two or more losses is the typical threshold most clinics use to start testing.

Can recurrent pregnancy loss be prevented?

Not always, but it can often be made less likely. When the workup finds a specific, treatable cause — a uterine abnormality, APLA syndrome, a thyroid or metabolic issue — treating it before and during the next pregnancy meaningfully improves the odds. When no cause is found, closer monitoring in early pregnancy is still the recommended approach.

Does recurrent pregnancy loss mean IVF is needed?

Not usually, and not automatically. IVF with PGT-SR is specifically relevant when a parental chromosomal rearrangement is found. For most other causes — uterine, hormonal, clotting-related, or unexplained — treatment addresses that specific cause within a natural or medically supported pregnancy, not IVF by default.

Who should be tested — just the woman, or both partners?

Both partners. Chromosomal factors can sit with either partner, and treating this as a one-person issue misses causes and adds unnecessary pressure. A proper RPL evaluation always includes both.