NHS
nhs.uk › conditions › overactive-thyroid-hyperthyroidism › diagnosis
Overactive thyroid (hyperthyroidism) - Diagnosis - NHS
thyroxine (T4) – another of the ... person of your age. A low level of TSH and high levels of T3 and/or T4 usually means you have an overactive thyroid....
Mayo Clinic
mayoclinic.org › diseases-conditions › hyperthyroidism › diagnosis-treatment › drc-20373665
Hyperthyroidism - Diagnosis and treatment - Mayo Clinic
November 30, 2022 - Understand what happens when your thyroid is overactive and learn about treatment for this condition.
Low TSH but high T4 and…
Looks like you might (probably?) have Graves! Go see an endo! More on reddit.com
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November 29, 2023What does this mean? Slightly high T4 and high TSH.
You had over range or near TSH all of last year. High TSH indicates some type of thyroid disease. What time of day were all of these blood draws? High TSH with high in range FT4 could be due to Hashimoto's and/or, possibly low FT3. T4 is converted into T3. Hashimoto's can cause problems with this conversion. You'll have to retest, since TSH, FT4, and FT3 all need to be tested as a group. Blood draw needs to be first thing in the morning. Both thyroid antibodies (TPO/ab and TG/ab) need to be tested to rule out Hashimoto's. It's very important to know if you have an autoimmune disease and if your hypothyroidism is caused by autoimmune Hashimoto's. Which type of thyroid replacement hormones and doses did you try when you experienced intolerance? What sort of symptoms did you experience, and what were your TSH and FT4 when you tried thyroid replacement hormone? More on reddit.com
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October 9, 2021What causes high TSH but normal T4?
The day before my blood test I didn't eat breakfast until 530 am More on reddit.com
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August 26, 2022High TSH and high T4?
I’d say, “hey, I respect you want to wait, but I would like to try to increase my dose. I can’t think straight, fatigued, irritable, brain fog. I’d like to try 75mcg to see if I can feel better, and I’d like to retest in 6 weeks to see the results.” I’ve found dictating works better than asking. It’s not like you’re asking for a narcotic. And honestly, those ranges - could be anyone’s ranges. My husband who is a bean pole might feel normal on the higher range. My normal is a TSH of a 1.0. If they don’t listen to you, just find someone new that will listen. More on reddit.com
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January 18, 2023Videos
01:43
TSH and T3/T4 - Whats the difference? Lab Values/ABG - Shorts | ...
04:48
Hyperthyroidism (Overactive Thyroid): Symptoms, Causes & Diagnosis ...
16:10
19 Signs of HYPERTHYROIDISM (Graves Disease) You Can See: Doctor ...
16:21
15 Signs of HYPOTHYROIDISM You Can See: Doctor Explains - YouTube
02:11
TSH and Thyroid Function Tests | UCLA Endocrine Center - YouTube
02:36
Thyroid Stimulating Hormone | UCLA Endocrine Center - YouTube
American Thyroid Association
thyroid.org › home › thyroid function tests
Thyroid Function Tests | American Thyroid Association
June 8, 2020 - Tests measuring free T4 – either ... a TSH. The finding of an elevated TSH and low FT4 or FTI indicates primary hypothyroidism due to disease in the thyroid gland....
Mayo Clinic
mayoclinic.org › diseases-conditions › hypothyroidism › diagnosis-treatment › drc-20350289
Hypothyroidism (underactive thyroid) - Diagnosis and treatment - Mayo Clinic
December 10, 2022 - Understand what happens when your thyroid is underactive and learn about treatment for this condition.
University of Michigan Health
uofmhealth.org › home › our care › specialties & services › hyperthyroidism & graves’ disease
Hyperthyroidism & Graves’ Disease | University of Michigan Health
A TSH level lower than normal indicates there is usually more than enough thyroid hormone in the body and may indicate hyperthyroidism. When hyperthyroidism develops, free thyroxine (T4) and free triiodothyronine (T3) levels rise above normal.
American Academy of Family Physicians
aafp.org › pubs › afp › issues › 2017 › 0601 › p710.html
Subclinical Hyperthyroidism: When to Consider Treatment | AAFP
June 1, 2017 - Subclinical hyperthyroidism is defined by a low or undetectable serum thyroid-stimulating hormone (TSH) level, with normal free thyroxine (T4) and total or free triiodothyronine (T3) levels.1 Subclinical hyperthyroidism can be divided into two ...
Children's Hospital of Philadelphia
chop.edu › conditions-diseases › hypothyroidism
Hypothyroidism in Children | Children's Hospital of Philadelphia
Hypothyroidism is diagnosed when the TSH levels are above normal and T4 levels are below normal. A less severe or earlier form of hypothyroidism is reflected by an elevated TSH and a low-normal T4, a condition called "compensated" or "subclinical" hypothyroidism.
PubMed Central
pmc.ncbi.nlm.nih.gov › articles › PMC5922674
How to interpret thyroid function tests - PMC
In the presence of suspected or confirmed central HPT dysfunction, TSH should not be considered to be a reliable marker of thyroid status and FT4 (±FT3) levels must be used to guide management. Common pitfalls in this setting include misinterpreting a low or undetectable TSH in a patient taking T4 as signifying over-replacement, or assuming that a normal TSH level equates with euthyroidism.5
American Academy of Family Physicians
aafp.org › pubs › afp › issues › 1998 › 0215 › p776.html
Subclinical Hypothyroidism: Deciding When to Treat | AAFP
February 15, 1998 - This state, termed “subclinical hypothyroidism,” is most commonly an early stage of hypothyroidism. Although the condition may resolve or remain unchanged, within a few years in some patients, overt hypothyroidism develops, with low free ...
Ucsf
ccpd.ucsf.edu › pituitary-disorders › hormonal-conditions › hypothyroidism
Hypothyroidism | California Center for Pituitary Disorders
Primary hypothyroidism occurs when the thyroid gland does not make sufficient amounts of thyroid hormone. It is usually characterized by high levels of thyroid-stimulating hormone (TSH) and low levels of the thyroid hormones triiodothryronine (T3) and tetraiodothryonine (T4).
American Medical Association
ama-assn.org › public-health › prevention-wellness › what-doctors-wish-patients-knew-about-hyperthyroidism
What doctors wish patients knew about hyperthyroidism | American Medical Association
July 3, 2025 - “Because the causes of elevated ... levels, T4 and T3, are elevated. If the TSH is very low, even with normal thyroid hormone levels, the thyroid levels are too high for that individual.”...
NCBI
ncbi.nlm.nih.gov › books › NBK519536
Hypothyroidism - StatPearls - NCBI Bookshelf
February 18, 2024 - Classic clinical features, including ... assess for primary hypothyroidism in most patients initially.[2] Characteristic laboratory findings of hypothyroidism include elevated TSH levels and low free T4 levels....
MedlinePlus
medlineplus.gov › home › medical tests
Thyroxine (T4) Test: MedlinePlus Medical Test
TSH tells your thyroid how much hormone to make. Normally, if your T4 levels are too low, your pituitary makes more TSH to make your thyroid work harder. If your T4 levels are too high, your pituitary stops making TSH.
Cleveland Clinic
my.clevelandclinic.org › health › diseases › 23903-subclinical-hyperthyroidism
Subclinical Hyperthyroidism: What It Is, Symptoms & Treatment
July 21, 2025 - However, in subclinical hyperthyroidism, due to a variety of possible thyroid issues, thyroid hormonal output doesn’t decrease like it normally should in response to the low TSH levels.
NHS
nhs.uk › conditions › underactive-thyroid-hypothyroidism
Underactive thyroid (hypothyroidism) - NHS
Find out about an underactive thyroid (hypothyroidism), including the symptoms, treatments, possible complications and where to find support.
Mount Sinai
mountsinai.org › health-library › report › hypothyroidism
Hypothyroidism Information | Mount Sinai - New York
When thyroxine (T4) levels drop ... increase. Thyroxine (T4). T4 is the key hormone produced in the thyroid gland. Low levels of T4 produce hypothyroidism, and high levels produce hyperthyroidism....
British Thyroid Foundation
btf-thyroid.org › subclinical-thyroid-disease
Subclinical thyroid disease
Learn about subclinical (borderline) thyroid conditions
UCLA Health
uclahealth.org › medical-services › surgery › endocrine-surgery › conditions-treated › thyroid › normal-thyroid-hormone-levels
Normal Thyroid Hormone Levels - Endocrine Surgery | UCLA Health
A normal Total T4 level in adults ranges from 5.0 to 12.0μg/dL. A normal Total T3 level in adults ranges from 80-220 ng/dL. Free T3 assays are often unreliable and not routinely used to assess thyroid function. Primary Hypothyroidism A high TSH and low thyroid hormone level (e.g.
Reddit
reddit.com › r/thyroidhealth › low tsh but high t4 and…
r/thyroidhealth on Reddit: Low TSH but high T4 and…
November 29, 2023 -
I’m a 29 year old female and with some blood tests just discovered I have low TSH and other high thyroid tests. I will attach below. What does this mean? Everything I google says, Graves’ disease, hashimotos or overactive thyroid. My husband and I are trying to conceive. We recently suffered a miscarriage back in September. I wonder if this had anything to do with it.
Top answer 1 of 5
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Looks like you might (probably?) have Graves! Go see an endo!
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If it’s Graves, you will be put on an anti thyroid medication. Please make sure to tell your endocrinologist that you are trying to conceive. There are 2 kids of anti thyroid meds and one does not endanger the baby.
Consensus
consensus.app › questions › low-tsh-high-t3-normal-t4
Low Tsh High T3 Normal T4 - Consensus Academic Search Engine
Some studies suggest that low TSH with high T3 and normal T4 may indicate biochemical hyperthyroidism, while other studies suggest it could be related to the slow response of the brain-thyroid axis or other underlying conditions.