The short explanation
Positive TPO antibodies mean your immune system is reacting to your thyroid. With a normal TSH, your thyroid is currently working well. Some studies link positive antibodies with a slightly higher risk of miscarriage and with the thyroid becoming underactive over time, especially in pregnancy. Because of this, doctors usually monitor thyroid function more closely when you are trying and once you are pregnant, so treatment can be started if TSH rises.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Whether treatment is offered for positive antibodies with normal TSH is debated. Good-quality studies have not shown clear benefit for all women, so doctors decide case by case, considering past miscarriages, fertility treatment and the exact TSH.
- Tell your doctor as soon as you have a positive pregnancy test, so thyroid tests can be repeated early.
- Positive antibodies are common and many women with them have healthy pregnancies.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This answer cannot tell whether you need treatment or what your risk is. Your doctor will decide from your results and history.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- How often should my thyroid be checked while trying and in pregnancy?
- Would you consider treatment in my situation?
- What TSH level would you want before and during pregnancy?
- Does this affect any fertility treatment we plan?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Book an appointment soon
- See your doctor within a few days of a positive pregnancy test to arrange thyroid tests.
Raise it at a routine appointment
- Book a routine follow-up for repeat thyroid tests while trying.
Sources
The evidence this explanation is built on.
- Infertility NHS
- Miscarriage NHS
- Infertility 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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