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Doctor insights on: Do I Need To Fast Before A Thyroid Blood Test

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Can hyper thyroidism or thyroid meds cause a high bac reading in a blood test?

Can hyper thyroidism or thyroid meds cause a high bac reading in a blood test?

Unclear question: What is a "bac reading"? It may help if you spell out your concern. ...Read more

Dr. Brad Goldenberg
13 doctors shared insights

Thyroid (Definition)

The thyroid is an endocrine gland that sits in the lower part of the neck. It produces thyroid hormone - which ...Read more


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Do I have to fast for thyroid blood test? It read that I don't have to. The never told me that I had to either.

Do I have to fast for thyroid blood test? It read that I don't have to. The never told me that I had to either.

No: You do not need to fast for thyroid function tests. However, if your doctor ordered other tests, e.g. blood lipids, or blood glucose, fasting is required.
For good health — Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex.
Get HPV vaccine. ...Read more

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Is it possible for me to drink coffee before a thyroid blood test?

You may: If thyroid blood test is the only test you are having, coffee is not likely to materially affect the results. Generally it is better to be fasting for lab tests. ...Read more

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My thyroid blood test is 16 what does this mean?

My thyroid blood test is 16 what does this mean?

Please Clarify: There are several thyroid blood tests with different result parameters. You must be specific with the test you are asking about. ...Read more

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What are thyroid results from my blood test normal?

What are thyroid results from my blood test normal?

Normal thyroid : Hi. If your blood tests for thyroid function (TSH & free T4) are normal, it means your thyroid is not over-producing or under-producing thyroid hormone, and that thyroid hormone is being made normally. ...Read more

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Nwhat is the abreviation for thyroid in a blood test?

Nwhat is the abreviation for thyroid in a blood test?

TSH: When a doctor orders a blood test to look at the thyroid and its function, they might order a tsh, which stands for thyroid stimulating hormone. You can also look at T3 (liothyronine) and T4 levels, which represent the serum amounts of the products produced by the thyroid and its general activity. ...Read more

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Can you do special blood test just for a thyroid?

Yes: A single test can be done on a blood sample to start the investigation. Pcp can do it. ...Read more

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How can my thyroid levels appear low on a blood test?

How can my thyroid levels appear low on a blood test?

See below: T4 and T3 (liothyronine) are two major thyroid hormones and can be measured accurately in blood. The levels will be low if you thyroid is functioning less than normal. See this site for more info.
http://www.thyroid.org/wp-content/uploads/patients/brochures/FunctionTests_brochure.pdf ...Read more

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My thyroid blood test came out low what does that mean?

My thyroid blood test came out low what does that mean?

Hypothyroid: My impression u are referring to measuring thyroxine levels called t4has a range which is wide so unless accompanied by high TSH not much significance unless suspecting what is secondary hypothyroid uncommon. ...Read more

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Help, how much blood is taken for a thyroid blood test?

Help, how much blood is taken for a thyroid blood test?

Depends on type of: Tests. Usual thyroid function tests can be done on about 5 ml of blood. ...Read more

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Do you have to take a blood test to get your thyroid checked?

Do you have to take a blood test to get your thyroid checked?

Yes: The way to know thyroid functions is through blood testings. ...Read more

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Can a person have a thyroid problem and not show on a blood test?

Can a person have a thyroid problem and not show on a blood test?

Yes: Patients can have normal function of the thyroid which is measured by blood test but have an enlarged thyroid or thyroid nodules which are seen with imaging on ultrasound. ...Read more

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What does it mean when the nurse says that your thyroid blood test is high?

What does it mean when the nurse says that your thyroid blood test is high?

Depends: It depends on what the nurse is referring to. She may be referring to a TSH level being high, in which case your thyroid level may be low (hypothyroid). She may be referring to a T4 or free T4 level being high, in which case your thyroid level is high (hyperthyroidism). ...Read more

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Can you tell me all about what is checked when they do a thyroid blood test?

Many possibilities: There are many possible thyroid blood tests, depending upon which particular disorder someone is looking for. The most common is a tsh, which is a pituitary hormone that is very sensitive but not very specific for telling you what kind of thyroid problem you have. Check w/your doctor. ...Read more

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Is a thyroid blood test of 0.87 normal? Is a thyroid blood test of 0.87 normal?

Is a thyroid blood test of 0.87 normal? Is a thyroid blood test of 0.87 normal?

Is this TSH level?: There are several types of thyroid tests like TSH level or T4 level. So you need to indicate the exact name of the test done. If it is tsh... This is normal. ...Read more

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What does it mean when your results from a blood test show thyroid level a little low?

Need more info: Results of lab tests need to be interpreted in the context of whole health status. What test did you have and what was the actual result? It would be prudent to discuss the results with the doctor who ordered the tests. ...Read more

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If my thyroid blood test comes back and they say its high is that over or under active?

If my thyroid blood test comes back and they say its high is that over or under active?

Which thyroid test?: There are many thyroid tests so your question is impossible to answer. If you are talking about the TSH test (most common) then a high TSH indicates an underactive thyroid. If you are talking about T4 or T3 (liothyronine) (free or total) then high levels indicate an overactive thyroid. ...Read more

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Symptoms on here thyroid blood test came back 1.39 is this normal & what could be wrong with me??

Thyroid: What symptoms?
You need to ask your doctor to give you all the results related to your thyroid, not just one. You need to know if your thyroid levels are normal or not, then you and your doctor can make decisions about treatment if needed. ...Read more

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Can an under active thyroid get better? I stopped taking meds after 4 years. Blood test came back normal! Did it heal? No more meds?

Can an under active thyroid get better? I stopped taking meds after 4 years. Blood test came back normal! Did it heal? No more meds?

Complex answer: Good question. I would want to know: 1. Were you hypothyroid in the first place. 2. What was the cause? Was your neck tender? If you had subacute thyroiditis, you could be transiently hypo and then recover completely. If you had hashimotos, you can have a flair, and then recover, but you will likely become permanently hypo eventually. Don't assume you are permanently better; good follow up. ...Read more

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Would hashimotos normally be picked up in a blood test checking my thyroid?

Yes: It can be picked up on a blood test but your doctor has to specifically order the test called thyroid peroxidase antibodies (tpo antibodies). ...Read more

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Could a thyroid blood test miss a hypothyroid issue?

Could a thyroid blood test miss a hypothyroid issue?

Yes: There are several parts to a thyroid blood test. Often only 1 part is used, called a TSH (thyroid stimulating hormone.) if it is high normal and a person has symptoms of low thyroid, like depression, weight gain, intolerance to cold, the practitioner often gets a different test, a free circulating thyroid hormone. When it's all borderline it is often worth a trial of low dose thyroid replacement. ...Read more

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Does nutri thyroid affect blood test results?

It's bullshit: Hi. Nutri Thyroid is utter bullshit, and you're throwing your money away on snake oil. That snake oil does nothing for a healthy thyroid that good old (cheap) iodized salt won't do. And you're making the snake oil peddlers rich. May I suggest you stop throwing that money away, and instead give it to some group that will do some good in the world?! ...Read more

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Might a thyroid blood test show hormonal problems?

Possibly: Thyroid produces a hormone so depending on what you are looking for thyroid blood test can show if there is a thyroid hormone problem but other hormones require other tests. ...Read more

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Got all symptoms for thyroid but blood test come back clear?

Need more info: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, you did not say what symptoms, what tests and what were the actual results. It would be prudent to discuss the matter with your doctor. ...Read more