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do I need to fast before a thyroid blood test

A 48-year-old member asked:
Dr. Gurmukh Singh
48 years experience Pathology
Unclear question: What is a "bac reading"? It may help if you spell out your concern.
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A 24-year-old female asked:
Dr. Gurmukh Singh
48 years experience Pathology
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 requi ... Read More
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A 28-year-old female asked:
Dr. Gurmukh Singh
48 years experience Pathology
No: Water with electrolytes will not affect thyroid blood tests. However, you are wasting your money on such water. Tap water is just as good if not bette ... Read More
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A 53-year-old member asked:
Dr. Gurmukh Singh
48 years experience Pathology
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 ... Read More
A member asked:
Dr. Anthony LaBarbera
27 years experience Pediatrics
Depends: It depends on the result. Can not really answer without the results.
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A female asked:
Dr. Robert Killian
27 years experience General Practice
Please Clarify: There are several different thyroid blood tests with different result parameters. You must be specific with the test you are asking about.
A 41-year-old member asked:
Dr. Thomas Knecht
30 years experience Endocrinology
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 ho ... Read More
A 69-year-old member asked:
Dr. Randy Burgett
8 years experience General Practice
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 ... Read More
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A 32-year-old member asked:
Dr. Richard Federbush
35 years experience Internal Medicine
Yes: A thyroid panel consisting of tsh, t4, and free T3 (liothyronine) can give a lot of information regarding thyroid function.
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A 48-year-old member asked:
Dr. Gurmukh Singh
48 years experience Pathology
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 ... Read More

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