You have been diagnosed with thyroid disease. If you wish to become pregnant in the future we would advise the following:
- Before you plan to become pregnant please have your thyroid function tested. Your GP should aim for a TSH level of 2.5mU/L or less (if on thyroxine) or within the normal range (if not on thyroxine).
- If you miss a period, perform a pregnancy test. If this is positive and you are on thyroxine immediately increase your dose. You may choose either of these two ways to do this (but not both).
- Take an extra 25micrograms of thyroxine every day.
- Double your daily dose of thyroxine, but only on two days per week. For example:
|Pre-pregnancy Daily Dose||Pregnancy Daily Dose|
|Monday||Pre-pregnancy Daily Dose 100micrograms||Pregnancy Daily Dose 200micrograms|
|Tuesday||Pre-pregnancy Daily Dose 100micrograms||Pregnancy Daily Dose 200micrograms|
|Wednesday||Pre-pregnancy Daily Dose 100micrograms||Pregnancy Daily Dose 100micrograms|
|Thursday||Pre-pregnancy Daily Dose 100micrograms||Pregnancy Daily Dose 100micrograms|
|Friday||Pre-pregnancy Daily Dose 100micrograms||Pregnancy Daily Dose 100micrograms|
|Saturday||Pre-pregnancy Daily Dose 100micrograms||Pregnancy Daily Dose 100micrograms|
|Sunday||Pre-pregnancy Daily Dose 100micrograms||Pregnancy Daily Dose 100micrograms|
- If you have a positive pregnancy test, please make an appointment with your GP as soon as possible for a thyroid blood test. Your GP should aim for a TSH level of 2.5mU/L or less.
- You should also arrange to be referred to the thyroid clinic by your GP so that we can monitor your thyroid function during pregnancy.
- An antibody level (called an anti-TSH receptor antibody) should be checked in the later part of pregnancy. Your obstetrician or endocrine/thyroid physician will do this, but please remind them that you have been advised to have this done.
Please keep this leaflet in a safe place and give a copy to your GP.
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Cambridge University Hospitals
NHS Foundation Trust
Hills Road, Cambridge
Telephone +44 (0)1223 245151