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The film in words
If you’re planning a pregnancy, tell your doctor, and ideally have a blood test before you conceive.
Pregnancy usually needs more levothyroxine, especially in the first 20 weeks, so the baby gets enough thyroid hormone.
The British Thyroid Foundation’s advice is that the dose is generally increased as soon as you know you’re pregnant. Contact your GP and arrange a thyroid blood test, so the dose can be adjusted.
You’ll have regular blood tests through the pregnancy. TSH is lower in pregnancy and T4 slightly higher, so the ranges are different.
Tell your midwife or obstetrician if you have a thyroid condition, or have had one.
After the birth, you’ll probably go back to the dose you took before the pregnancy, with a blood test a few weeks later. It’s safe to breastfeed while taking levothyroxine.
Postpartum thyroiditis is a temporary inflammation of the thyroid after 5 to 10 in 100 pregnancies. It’s more likely with thyroid antibodies, and usually shows within 6 to 12 months of the birth.
If you take antithyroid medicine, don’t stop it before speaking to your doctor.
Sources: British Thyroid Foundation: pregnancy and fertility; British Thyroid Foundation: subclinical thyroid disease
More films
How your thyroid worksThe gland, its two hormones, and the signal from the brain that runs it.1 min 15
What your blood test showsWhat a usual test looks at, TSH and free T4 side by side, and lab ranges.1 min 31
Hashimoto’s: why the thyroid slows downThe immune system, TPO antibodies, and why the test isn’t repeated.1 min 04
Levothyroxine, and how to take itWhat it does, taking it so it’s absorbed, missed doses, and why changes take time.1 min 41
Still not feeling right?When results are in range but symptoms aren’t, and what to ask your GP.1 min 16
Basic and full thyroid testsWhat TSH, free T4, free T3 and the two antibodies each add.1 min 33
Lab ranges and your reportThe units on a report, typical ranges as a guide, age, and antibody cut-offs.1 min 17
TPO antibodies, in detailWhat a positive result can mean, with or without a thyroid problem, and why it stays.1 min 11
Tg antibodies, in detailThyroglobulin, why it’s watched after thyroid cancer, and what its antibodies change.58 sec
Iron, B12 and vitamin DOther results you may have, why they come up with the thyroid, and coeliac disease.1 min 25
General information, not a diagnosis. Your GP can tell you what your results mean for you.