The short explanation
Positive thyroid antibodies have been linked in studies with a somewhat higher chance of miscarriage, even when thyroid levels are normal. However, most women with positive antibodies have successful pregnancies, and a single early miscarriage is most often caused by chance problems with the pregnancy itself, not by anything the woman did. Whether treatment helps women with positive antibodies and normal thyroid levels is still debated. Your doctor may suggest checking TSH before trying again and early in pregnancy, and may consider treatment if TSH is above the target used in pregnancy.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- What matters most is your TSH before and during pregnancy. If it is raised, treating it is generally recommended.
- After repeated miscarriages, doctors usually investigate several possible causes, including blood clotting conditions, uterine shape and chromosomes, not only thyroid.
- Grief after miscarriage is real. It is fine to ask for support and to take the time you need before trying again.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This answer cannot tell you why your miscarriage happened or what your chance is in the next pregnancy. Your doctor can look at your full history.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Should my TSH be checked before I try again?
- Would you suggest treatment because of my antibodies?
- How early in pregnancy should my thyroid be tested?
- Are any other tests needed after my miscarriage?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Emergency — call 112 now
- Call 112 if you are pregnant and have heavy bleeding, severe one-sided abdominal pain or fainting.
Book an appointment soon
- See your doctor within a few days of a positive pregnancy test so your thyroid can be checked early.
Raise it at a routine appointment
- Book a routine visit before trying again to review your thyroid results.
Sources
The evidence this explanation is built on.
- Thyroid disease and pregnancy NIDDK (NIH)
- Thyroid tests MedlinePlus (NIH)
- Hypothyroidism MedlinePlus (NIH)
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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