What Is Recurrent Pregnancy Loss? Definition, Possible Causes, and Evaluation

Recurrent pregnancy loss (commonly called habitual miscarriage) generally refers to consecutive spontaneous miscarriages, with clinical definitions varying—some count 2 consecutive losses, others 3. It may be associated with chromosomal, uterine structural, endocrine (e.g., thyroid), coagulation, or immune factors, among others, and a significant proportion have no single identifiable cause. Recurrent pregnancy loss requires professional evaluation; it is recommended to consult an obstetrician-gynecologist or reproductive medicine specialist for testing, clarification of possible factors, and discussion of next steps. The following is a neutral summary, not medical advice.

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Possible Causes of Recurrent Pregnancy Loss

The causes of recurrent pregnancy loss are diverse and often require comprehensive evaluation. Below are common categories of possible factors (actual assessment by physician):

Category	Possible Involvement
Chromosomal/Genetic	Parental chromosomal structural abnormalities, embryonic chromosomal abnormalities
Uterine Structure	Septate uterus, fibroids, polyps, intrauterine adhesions, etc.
Endocrine/Metabolic	Thyroid dysfunction, blood glucose control, prolactin, etc.
Thrombophilia	Certain coagulation-related abnormalities
Immune-Related	Some autoimmune factors
Unexplained	A significant proportion have no single identifiable cause after complete evaluation

Causes vary among individuals, and multiple factors may coexist. Differential diagnosis and diagnosis are medical professional matters and must be performed by an obstetrician-gynecologist or reproductive medicine specialist. This section is a neutral educational summary, not medical advice.

Common Evaluation Directions (Both Partners)

Evaluation for recurrent pregnancy loss often involves both partners and is tailored to history. Common directions include:

Chromosomes: Karyotype analysis of both partners.
Uterine Cavity Assessment: Ultrasound, hysteroscopy, or other imaging to examine structure.
Endocrine: Thyroid function, blood glucose, prolactin, etc.
Coagulation Function: Certain coagulation-related markers.
Immune-Related: Some immune tests as determined by the physician.

Actual tests and their order are determined by the physician based on individual circumstances; not all tests are necessarily performed. Also refer to our pages on "AMH Test," "What Is PGT," and "What to Prepare for Your First Visit."

Next Steps and Today's First Step

After clarifying possible causes, next steps are discussed by the physician with the couple based on individual circumstances and preferences. Common aspects include:

Targeted Treatment: Such as evaluation and management of uterine structural issues, endocrine adjustments, etc., as recommended by the physician.
Embryo Chromosomal Issues: If relevant, the physician may discuss options such as IVF with PGT-A (applicability varies by individual).
When Unexplained: Follow-up and subsequent attempts can still be discussed with the physician.
Emotional Well-being: Recurrent pregnancy loss can have significant emotional impact; seek support if needed.

Today's First Step (Immediate Action): Compile records of each previous miscarriage (gestational age, timing, and relevant test results), along with both partners' medical history, and schedule an appointment with an obstetrician-gynecologist or reproductive medicine specialist to assess whether a series of evaluations for recurrent pregnancy loss and next steps should be initiated. Whether assisted reproductive technology or PGT is needed should be based on the physician's assessment. This page is neutral educational information, not medical advice.

FAQ

How is recurrent pregnancy loss defined? How many losses count?

It generally refers to consecutive spontaneous miscarriages. Clinically, some define it as 2 consecutive losses, others as 3, with variations among professional organizations and physicians. The exact definition and whether evaluation is needed should be determined by the physician based on individual circumstances. This page is neutral information, not medical advice.

What are the possible causes of recurrent pregnancy loss?

Possible factors include: chromosomal abnormalities in parents or embryos, uterine structural issues (e.g., septate uterus, fibroids, adhesions), endocrine disorders (e.g., thyroid dysfunction, blood glucose), thrombophilia, and some immune-related factors. Causes vary among individuals and often require comprehensive evaluation; assessment by a physician is necessary.

Can a cause always be found for recurrent pregnancy loss?

Not necessarily. Even after complete evaluation, a significant proportion have no single identifiable cause (unexplained). Not finding a cause does not mean there is no hope; next steps should be discussed with the physician based on the overall situation. This page is neutral information.

What tests are typically done for recurrent pregnancy loss?

Based on physician assessment, tests may include parental chromosomal analysis, uterine cavity evaluation (ultrasound, hysteroscopy, etc.), endocrine and thyroid tests, coagulation function tests, and some immune-related tests. Actual tests vary by individual and are arranged by the physician based on history and condition.

Is age related to recurrent pregnancy loss?

Age is a common related factor. As age increases, the chance of embryonic chromosomal abnormalities may also rise, which is a common cause of miscarriage. However, the causes of recurrent pregnancy loss are diverse, and age is only one factor; comprehensive evaluation by a physician is needed.

What is the relationship between recurrent pregnancy loss and IVF/PGT?

If evaluation suggests a strong association with embryonic chromosomal factors, the physician may discuss options such as IVF with preimplantation genetic testing (PGT-A). However, whether this is applicable depends on individual causes and circumstances; not all cases of recurrent pregnancy loss require or are suitable for it. See our page "What Is PGT" for details; actual decisions should be based on physician assessment.

How long after recurrent pregnancy loss can I try to conceive again?

The timing for attempting pregnancy again varies depending on physical recovery, emotional adjustment, and whether specific causes need to be addressed first. There is no one-size-fits-all answer. It is recommended to discuss test results and individual circumstances with a physician before deciding, and to pay attention to physical and emotional recovery. This page is neutral information, not medical advice.

I want to find the cause of recurrent miscarriage. What can I do today?

An immediate step you can take: Compile records of each previous miscarriage (gestational age, timing, and relevant test results), along with both partners' medical history. Bring this information to an appointment with an obstetrician-gynecologist or reproductive medicine specialist to assess whether a series of evaluations for recurrent pregnancy loss and next steps should be initiated.

Further References (Official Data Sources)

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Updated: 2026-07-29 · This page is a neutral compilation of information, for reference only, not medical advice, and does not constitute any treatment commitment. Actual regulations and treatments should be based on announcements from competent authorities and explanations from qualified physicians.