Miscarriage is common. Around one in five recognised pregnancies ends this way, and a single loss is usually a chance event rather than a sign of a problem. Repeated loss is different, and it deserves proper investigation rather than being told to simply try again.
Around half of couples investigated find no identifiable cause, which is frustrating, and yet many of them go on to have a successful pregnancy.
When Investigation Should Begin
Traditionally investigation started after three consecutive losses. Most units now investigate after two, and there are situations where it should begin after one.
- Two or more consecutive first trimester losses
- One loss after twelve weeks
- Any loss where an abnormality was found on scan
- A loss in a woman over thirty five, where waiting is costly
- A loss alongside a known autoimmune condition or clotting disorder
Being told to keep trying without assessment after two losses is reasonable only if you have chosen it. Asking for investigation at that point is entirely appropriate.
The Most Common Cause Is Chromosomal
Around half to two thirds of early miscarriages result from a chromosomal abnormality in the embryo, arising at conception. These are usually random events, not inherited, and not caused by anything either parent did.
The frequency rises with maternal age, because eggs accumulate errors in chromosome division over time. This is why miscarriage rates climb from around ten percent in the twenties to well over a third by the early forties.
Where tissue is available, testing it can identify a chromosomal cause, which is genuinely informative. It tells a couple the loss was a chance event rather than a recurring problem, and that alone changes the outlook considerably.
The Causes Worth Testing For
A focused set of investigations covers the treatable causes.
- Antiphospholipid syndrome: an autoimmune clotting condition, the single most important treatable cause. Diagnosed by blood tests repeated twelve weeks apart
- Uterine abnormalities: a septum, significant fibroids distorting the cavity, or adhesions
- Parental chromosomal rearrangements: a balanced translocation in one parent, found in a small percentage of couples
- Thyroid dysfunction and poorly controlled diabetes
- Cervical weakness, where losses occur in the second trimester
Investigation typically includes a pelvic ultrasound or hysteroscopy, thyroid and glucose testing, antiphospholipid antibodies, and karyotyping of both parents where indicated.
Tests That Are Often Sold and Rarely Useful
Recurrent miscarriage attracts a large number of investigations with weak evidence, and couples desperate for answers are vulnerable to them.
Extensive immune panels, natural killer cell testing, and many inherited thrombophilia screens beyond antiphospholipid antibodies have limited evidence for routine use. So do the treatments that follow from them, including intravenous immunoglobulin and steroids, which carry real risks.
If a treatment is being recommended, ask what evidence supports it in recurrent miscarriage specifically, and what the risks are. A reputable specialist will answer that directly.
What Treatment Actually Helps
Treatment depends entirely on what is found, and is genuinely effective where a cause is identified.
- Antiphospholipid syndrome: low dose aspirin with heparin injections, which improves live birth rates substantially
- Uterine septum: hysteroscopic division
- Thyroid dysfunction: correction before and during pregnancy
- Diabetes: tight control before conception
- Cervical weakness: a cervical stitch, or progesterone support
- Parental translocation: genetic counselling, with preimplantation genetic testing through IVF as an option
Progesterone support has evidence of benefit specifically for women with recurrent miscarriage who present with early pregnancy bleeding, rather than for everyone.
The Outlook When Nothing Is Found
Roughly half of couples complete investigation with no identified cause, which feels like failure. It is worth understanding what unexplained actually means here.
It usually means the losses were chromosomal chance events that happened to occur consecutively. Statistically that is entirely possible, and it carries a considerably better outlook than a persistent underlying problem.
Live birth rates in subsequent pregnancies for couples with unexplained recurrent loss are encouraging, commonly quoted between sixty and seventy percent. That figure is worth hearing, because most couples at this point assume the opposite.
Supportive Care in the Next Pregnancy
Early reassurance scanning and close contact with a familiar team improve outcomes in this group, and the effect appears to be real rather than only psychological.
Practical elements include an early scan at six to seven weeks to confirm a heartbeat, regular follow up through the first trimester, a named point of contact, and prompt assessment of any bleeding rather than being told to wait.
Our high risk pregnancy service provides this structure for couples with previous losses.
The Grief Is Real and Frequently Dismissed
Early pregnancy loss is often minimised by people around the couple, particularly when the pregnancy was not yet announced. The grief is genuine and does not scale with gestational age.
Anniversaries, due dates and other people's pregnancies are all difficult. Partners often grieve differently and at different times, which can create distance at exactly the moment support is most needed.
Counselling is appropriate and helpful, and it is part of our fertility counselling service. Seeking it is not an overreaction.
Recurrent miscarriage deserves systematic investigation of the causes that are treatable, and honest scepticism about the many tests that are not. Even when no cause is found, the outlook for a future pregnancy is considerably better than most couples fear.
For assessment, contact our fertility department or the gynaecology team at T. Nagar, Chennai.
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