After two consecutive miscarriages, the most important step is to request a formal evaluation for recurrent pregnancy loss. In the United States, two consecutive losses meets the clinical threshold for this diagnosis, which unlocks a specific set of tests designed to find treatable causes. The odds are still in your favor: even after two miscarriages, there’s roughly a 65% chance your next pregnancy will end in a live birth. But identifying and addressing any underlying issues can push those odds even higher.
Why Two Losses Triggers a Workup
Only about 2% of pregnant women experience two consecutive miscarriages, which is why most reproductive specialists recommend a full evaluation at this point rather than waiting for a third loss. The two biggest independent risk factors for another miscarriage are the number of previous losses and maternal age. That means the sooner a cause is identified, the better positioned you are for your next pregnancy.
Your OB-GYN can order many of the initial tests, but if your provider doesn’t have experience with recurrent loss, ask for a referral to a reproductive endocrinologist. These specialists run more targeted diagnostics, monitor early pregnancies with blood work every few days and weekly ultrasounds, and can manage treatments that a general OB-GYN typically doesn’t offer.
Blood Tests You Should Expect
A recurrent loss workup involves several categories of blood tests, each looking for a different type of problem. None of them are invasive, and most can be drawn in a single visit.
- Antiphospholipid antibodies: This panel checks for an immune condition called antiphospholipid syndrome, one of the most common treatable causes of recurrent loss. The blood tests look for specific antibodies (lupus anticoagulant, anticardiolipin antibodies, and beta-2 glycoprotein I antibodies) that cause abnormal clotting in the placenta. If positive, the tests are repeated 12 weeks later to confirm the diagnosis.
- Thyroid function: Both underactive and overactive thyroid can contribute to miscarriage. Your provider will check thyroid hormone levels and thyroid antibodies. For context, TSH levels between 2.5 and 4.0 mIU/L are not associated with increased miscarriage risk, so mild elevations in that range are generally not a concern.
- Clotting disorders: Beyond antiphospholipid syndrome, some women carry inherited gene mutations that increase blood clotting risk. Testing may include screening for factor V Leiden, prothrombin gene mutations, and deficiencies in proteins that regulate clotting.
- Hormone levels: Your doctor may check ovarian reserve markers and reproductive hormones, particularly if there are concerns about egg quality or ovulation patterns.
Checking the Uterus for Structural Problems
The initial evaluation should include some form of uterine imaging. A pelvic ultrasound is the starting point, but a sonohysterography (where saline is gently infused into the uterus during an ultrasound) gives a much clearer picture of the uterine cavity. These tests look for structural issues like a uterine septum (a wall of tissue dividing the uterus), fibroids pressing into the cavity, polyps, or scar tissue from previous procedures.
The good news is that most of these problems are surgically correctable. A uterine septum, intrauterine adhesions, and fibroids that protrude into the cavity can all be removed through a hysteroscopy, a minimally invasive procedure done through the cervix with no abdominal incisions. Recovery is typically quick, and outcomes for future pregnancies improve significantly once the issue is resolved.
Genetic Testing for Both Partners
About 1 in 30 couples with recurrent pregnancy loss carry a balanced chromosomal rearrangement. This means one partner’s chromosomes have swapped segments in a way that doesn’t affect their own health but can produce embryos with the wrong amount of genetic material. These embryos often miscarry early.
A simple blood test called a karyotype, drawn from both you and your partner, can detect this. If a translocation or inversion is found, it doesn’t mean you can’t have a healthy pregnancy. It does mean that some percentage of embryos will be chromosomally unbalanced. Options at that point include continuing to try naturally (since many embryos will still be normal) or pursuing IVF with preimplantation genetic testing to select embryos with the correct chromosome arrangement before transfer.
The Male Factor Most People Miss
Recurrent loss evaluations have historically focused almost entirely on the woman, but research increasingly points to the male partner’s contribution. A meta-analysis pooling data from 13 studies found that male partners of women with recurrent loss have significantly higher rates of sperm DNA fragmentation compared to partners of women without loss history. DNA fragmentation means the genetic material inside sperm is damaged, which can lead to embryos that implant but fail to develop normally.
Standard semen analyses don’t test for DNA fragmentation. If your standard workup comes back normal, it’s worth asking about a sperm DNA fragmentation test for your partner. Lifestyle changes like quitting smoking, reducing alcohol, and avoiding heat exposure to the testicles can improve fragmentation levels. In some cases, a urologist specializing in male fertility may recommend antioxidant supplements or other interventions.
Lifestyle Changes That Improve Your Odds
While the link between lifestyle factors and recurrent loss specifically is less clear-cut than for sporadic miscarriage, the overall direction of the evidence is consistent. Smoking damages placental function. Heavy caffeine intake and alcohol use are associated with increased miscarriage risk. Obesity adds another layer of risk, and women with a high BMI may benefit from higher-dose folic acid supplementation.
The practical takeaway is straightforward: eliminating tobacco, alcohol, and recreational drugs while maintaining a healthy weight creates the best possible environment for early pregnancy. Stress reduction matters too, though “reduce stress” is easier said than done when you’re carrying the weight of two losses. What the evidence supports is that these changes, taken together, meaningfully improve the chances of a successful pregnancy.
What Treatment Looks Like
Treatment depends entirely on what the workup finds. If antiphospholipid syndrome is diagnosed, a combination of low-dose aspirin and a blood thinner during pregnancy is the standard approach, and it substantially improves live birth rates. If a thyroid condition is identified, medication to normalize thyroid levels before and during pregnancy is effective. If a uterine structural issue is found, surgical correction before the next pregnancy is the typical path.
One treatment you may hear about is progesterone supplementation in early pregnancy. A large randomized trial published in the New England Journal of Medicine found no benefit from progesterone in women with a history of unexplained recurrent miscarriage. Some providers still prescribe it, and it’s unlikely to cause harm, but the strongest evidence doesn’t support it as a standalone solution for unexplained losses.
For roughly half of couples with recurrent loss, no specific cause is found. That can feel frustrating, but the prognosis for unexplained recurrent loss is actually quite good. More than half of couples in this situation go on to have a healthy baby without any targeted treatment. Supportive early pregnancy care, including close monitoring with early ultrasounds and hormone level checks, is the main intervention, and it appears to make a real difference in outcomes.
What to Ask Your Doctor at the First Visit
Walking into an appointment after two losses can feel overwhelming. Having a focused list helps. Ask whether your provider does a full recurrent loss workup in-house or prefers to refer you to a reproductive endocrinologist. Ask specifically about antiphospholipid antibody testing, thyroid screening, uterine imaging, and karyotyping for both partners. Ask about sperm DNA fragmentation testing for your partner. And ask about the timeline: most of these tests can be completed within one to two menstrual cycles, so you don’t need to wait long before trying again if the results are reassuring.
The single most important thing you can do after two miscarriages is pursue a thorough evaluation before your next pregnancy. The majority of couples in your situation will have a baby. Getting the right tests done now gives you the best chance of making that happen sooner rather than later.