PubMed Central
pmc.ncbi.nlm.nih.gov › articles › PMC5515647
Subclinical hypothyroidism in pregnancy - PMC
Subclinical hypothyroidism is defined by a normal free thyroxine in the presence of an elevated thyroid-stimulating hormone (TSH).1 In pregnancy, its incidence is more common than overt hypothyroidism, ranging from 15% to 28% in iodine-sufficient regions.2 The upper limit of normal for TSH ...
American Thyroid Association
thyroid.org › home › patients portal › clinical thyroidology for the public › may 2017 › vol 10 issue 5 p.8
Subclinical hypothyroidism and pregnancy outcomes
May 15, 2017 - Subclinical hypothyroidism is defined by an increased TSH but a normal T4. It is clear that overt hypothyroidism should be treated, especially when diagnosed during pregnancy in the mother.
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Subclinical Hypothyroidism
I have Hashitmotos! I would make sure to get a full thyroid panel to see what your T3 and free T4 are also doing. It's better to have a TSH <2.5 when TTC from literature (I'm an NP). You can see my post history for where I was with my TSH (it was not in range). Or message me :) Also, babybumps is a good sub for this question. I know dealing with this is stressful during TTC.
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March 6, 2017Hypothyroidism and Pregnancy?
Hi! I've been diagnosed hypo for 8 years now and have been on levoxyl since then, maintaining normal levels. This is my first and I am 18 weeks and everything seems great so far! I do get my blood checked every 4-6 weeks, and they did up my dose as soon as they found out I was pregnant, so make sure you are talking to your endo about this and keeping track. I don't think there is much of a worry as long as you maintain a good level and keep watch. More on reddit.com
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July 2, 2016Hypothyroidism Diagnosed in Late 3rd Trimester
My doctor just did some follow up tests for my thyroid. They said my numbers were slightly elevated, but not enough for concern yet.
Has your doc been monitoring your numbers? Or was this the first time you were tested?
I asked mine about what the implications were, and she didn't seen too concerned. Said they'll keep monitoring for now, and if it gets to high, they'll put me on meds.
My TSH levels were at 2.7
I would ask your doctor about any concerns you have. At 37 weeks, I feel like if there was any real danger to baby, they would have gone ahead and delivered you.
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April 20, 2013Subclinical hypothyroid while TTC
I had sub clinical Hypothyroidism (at least i did when i started treatment) and then they found that i had PCOS to boot. but all the endo's i have seen haven't cared that its "with in " acceptable limits they have said that a young woman ttc should have her TSH around 1, and if its not then they are willing to work with you to get it there. also it should be noted that you shouldn't ttc till it's near one because the baby needs thyroid from you , and they will have to up your dose when you get pregnant. A regular dr will not treat you for Low or High TSH, that is still with in the range , you need to see a specialist.
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September 13, 2009New England Journal of Medicine
nejm.org › doi › full › 10.1056 › NEJMoa1606205
Treatment of Subclinical Hypothyroidism or Hypothyroxinemia in Pregnancy | New England Journal of Medicine
We screened women with a singleton ... hypothyroidism, defined as a thyrotropin level of 4.00 mU or more per liter and a normal free thyroxine (T4) level (0.86 to 1.90 ng per deciliter [11 to 24 pmol per liter]), and for hypothyroxinemia, ...
American Society for Reproductive Medicine
asrm.org › home › practice guidance › practice committee documents › subclinical hypothyroidism in the infertile female population: a guideline (2024)
Subclinical hypothyroidism in the infertile female population: a guideline (2024) | American Society for Reproductive Medicine | ASRM
May 1, 2024 - (55) retrospectively evaluated over 50,000 women with preconception TSH levels drawn from a large Chinese study. Subclinical hypothyroidism was not associated with preterm delivery, pregnancy loss, or large for gestational age births.
British Thyroid Foundation
btf-thyroid.org › subclinical-hypothyroidism-in-conception-and-pregnancy
Subclinical hypothyroidism in conception and pregnancy
October 7, 2025 - Find guidance for treating patients with subclinical hypothyroidism in conception and pregnancy
etj
etj.bioscientifica.com › view › journals › etj › 3 › 2 › ETJ362597.xml
2014 European Thyroid Association Guidelines for the Management of Subclinical Hypothyroidism in Pregnancy and in Children in: European Thyroid Journal Volume 3 Issue 2 (2014)
June 1, 2014 - Subclinical hypothyroidism (SCH) in pregnancy is defined as a thyroid-stimulating hormone (TSH) level above the pregnancy-related reference range with a normal serum thyroxine concentration.
NPS
nps.org.au › assets › 526733efa94dd275-ef2bb036d9c7-Thyroid-disorders-pregnancy-postpartum_40-214.pdf pdf
Thyroid disorders in pregnancy and postpartum
For women known to have hypothyroidism, an increase in thyroxine dose by 20–40% when · pregnancy is confirmed usually ensures they remain euthyroid. Treatment of subclinical
American Academy of Family Physicians
aafp.org › pubs › afp › collections › choosing-wisely › 413.html
Don’t screen asymptomatic pregnant women for subclinical hypothyroidism. | AAFP
March 30, 2020 - Subclinical hypothyroidism is defined ... healthy pregnant women. Subclinical hypothyroidism is unlikely to progress to overt hypothyroidism during pregnancy....
InfantRisk Center
infantrisk.com › content › hypothyroidism-and-pregnancy
HYPOthyroidism and Pregnancy | InfantRisk Center
In addition to an increase level ... during pregnancy. Pregnant women with subclinical hypothyroidism will have an elevated trimester-specific serum TSH level but a normal free T4 concentration....
Healthline
healthline.com › health › hypothyroidism › subclinical-hypothyroidism-pregnancy
Subclinical Hypothyroidism: Causes, Symptoms, Complications, Treatment
August 24, 2023 - Subclinical hypothyroidism during pregnancy is when your T4 (free thyroxine) levels are normal, but your TSH (thyroid stimulating hormone) levels are elevated. This is usually discovered during a blood test in early pregnancy.
Taylor & Francis Online
tandfonline.com › home › all journals › medicine › current medical research and opinion › list of issues › volume 40, issue 1 › optimizing levothyroxine treatment for s ....
Full article: Optimizing levothyroxine treatment for subclinical hypothyroidism during pregnancy
The onset of pregnancy places ... including subclinical hypothyroidism (SCH), may appear de novo at this time, or existing thyroid disease may become more severe....
Bmj
dtb.bmj.com › content › 57 › 2 › 22
Management for women with subclinical hypothyroidism in pregnancy | Drug and Therapeutics Bulletin
February 1, 2019 - Any treatment for SCH in pregnancy is currently based on low-quality evidence. A low starting dose of thyroxine could be used (50 µg) and thyroid function tests reviewed after 4–6 weeks to ensure no harm from iatrogenic thyrotoxicosis. More data are needed to inform the management of women with SCH who are positive for thyroid antibodies · Subclinical hypothyroidism (SCH) is defined as an elevated thyroid-stimulating hormone (TSH) concentration in combination with normal concentration of free thyroxine (T4).
UpToDate
uptodate.com › contents › hypothyroidism-during-pregnancy-clinical-manifestations-diagnosis-and-treatment
Hypothyroidism during pregnancy: Clinical manifestations, ...
UpToDate, the evidence-based clinical decision support resource from Wolters Kluwer, is trusted at the point of care by clinicians worldwide.
RACGP
racgp.org.au › afp › 2012 › august › thyroid-disease-in-the-perinatal-period
RACGP - Thyroid disease in the perinatal period
April 9, 2012 - Thyroid dysfunction affects 2–3% of pregnant women and one in 10 women of childbearing age with normal thyroid function have underlying thyroid autoimmunity, which may indicate reduced functional reserve.1 Up to 18% of women in the first trimester in Australia are thyroid antibody positive.2 Thyroid hormone plays a critical role in pregnancy and understanding the unique changes to thyroid physiology in pregnancy has important implications for the definition and treatment of thyroid disorders in pregnancy.
Oxford Academic
academic.oup.com › jes › article › 2 › 6 › 533 › 4990778
Subclinical Hypothyroidism in Women Planning Conception and During Pregnancy: Who Should Be Treated and How? | Journal of the Endocrine Society | Oxford Academic
June 1, 2018 - In some, but not all, studies, it has been associated with infertility, an increased risk of adverse pregnancy and neonatal outcomes, and possibly with an increased risk of neurocognitive deficits in offspring.
PubMed Central
pmc.ncbi.nlm.nih.gov › articles › PMC3179614
Subclinical Hypothyroidism in Pregnancy: Intellectual Development of Offspring - PMC
IQ level and cognitive performance ... pregnancy. Subclinical hypothyroidism (SCH), a relatively common abnormality in pregnancy, occurs in approximately 3% of pregnant women (1)....
NHS Lothian
apps.nhslothian.scot › refhelp › guidelines › endocrinology › thyroid-conditions-and-pregnancy › subclinical-hypothyroidism-and-pregnancy
Subclinical Hypothyroidism and Pregnancy – RefHelp
However, women with sub-clinical hypothyroidism who are planning pregnancy or become pregnant should be advised to seek GP review for a check of thyroid function and TPO antibodies and consideration of levothyroxine replacement depending on their results (see guidance and algorithm below). The following advice on the approach to subclinical hypothyroidism in pregnancy is based on the 2017 ATA guidelines.
US Pharmacist
uspharmacist.com › article › when-is-subclinical-hypothyroidism-treatment-optimal-in-pregnant-women
When Is Subclinical Hypothyroidism Treatment Optimal in Pregnant Women?
February 8, 2017 - They point out that pregnant women ... milli-international units per liter (mIU/L). When their TSH levels rise above that level, expectant mothers might experience subclinical hypothyroidism, and some international guidelines recommend ...
ACOG
acog.org › clinical › clinical-guidance › practice-bulletin › articles › 2020 › 06 › thyroid-disease-in-pregnancy
Thyroid Disease in Pregnancy | ACOG
ABSTRACT: Both thyrotoxicosis and hypothyroidism are associated with adverse pregnancy outcomes. There also is concern about the effect of overt maternal thyroid disease on fetal development. In addition, medications that affect the maternal thyroid gland can cross the placenta and affect the fetal thyroid gland. This document reviews the thyroid-related pathophysiologic changes that occur during pregnancy and the effects of overt and subclinical maternal thyroid disease on maternal and fetal outcomes.
Ranzcog
ranzcog.edu.au › wp-content › uploads › Hypothyroidism.pdf pdf
Subclinical hypothyroidism and hypothyroidism in pregnancy (C-Obs 46)
Subclinical hypothyroidism is defined as serum TSH above the reference range, and FT4 within the normal ... Overt hypothyroidism is uncommon in pregnancy as it is associated with anovulation and increased rates of