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Doctor insights on: Ct Thyroid Scan No Antihistamines

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I'm due to have a thyroid scan in 3 days. Yesterday, I took two 25 mg antihistamine pills. Will this affect the results?

I'm due to have a thyroid scan in 3 days.  Yesterday, I took two 25 mg antihistamine pills.  Will this affect the results?

No, it should not.: The half life of most antihistamines should be less than 24 hrs and should be out of the system by then. I would check with the radiology center to confirm their policy. I would also avoid any more antihistamines until the time of testing. ...Read more

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Dr. James Krick
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Computed Tomography (Definition)

Computed tomography is also known as CT scan. Ct uses xrays taken an 360 degrees combined with a computer to see"inside" the body. The table moves as the xray tube and detectors spin around the patient 10 times a second or more! the image shows excellent soft tissue detail, enhanced with injection of intravenous contrast or oral contrast. This way the body is shown in slices, in any plane, usually axially, but ...Read more


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Ent for neck lump.Negitive ct, and thyroid scan. Cancer, what to do?

Ent for neck lump.Negitive ct, and thyroid scan. Cancer, what to do?

Characterize lump: If lump is superficial in location ultrasound is more beneficial in characterizing type of tissue, and may need eventual biopsy. Mr examination for both superficial and deeper soft tissue characterization is usually better than ct examination. Again with all imaging modalities, the final diagnosis depends on biopsy and pathology. ...Read more

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How soon can you have a thyroid scan after a cat scan with contrast?

How soon can you have a thyroid scan after a cat scan with contrast?

About six weeks: The timing is somewhat subjective and depeds on the metabolic activity of your thyroid. Generally waiting six weeks will give an accurate reading on a nuclear thyroid scan following a contrast ct. ...Read more

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Can any of these CT scan, thyroid scan, and ultrasound cause cancer?

Can any of these CT scan, thyroid scan, and ultrasound cause cancer?

Yes and no: Causality is hard to prove in medicine. Multiple ct exposure - especially in the young has been associated with increase risk of certain cancer but not all kids who had cts will have cancer. Thyroid scan and ultrasound have not been specifically implicated as contributors to the process of cancer development. ...Read more

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Am I able to take a Multi-vitamin that contains Iodine when I am allergic to shrimp? I had to be on an antihistamine while prepping for a CT scan.

Am I able to take a Multi-vitamin that contains Iodine when I am allergic to shrimp? I had to be on an antihistamine while prepping for a CT scan.

The shellfish : allergy leading to an increased risk of iodinated contrast allergic reaction is a myth that, unfortunately, is difficult to eradicate. There is nothing special about a shellfish allergy, if you have multiple allergies you are at some increased risk of a contrast reaction whether or not one of the allergies is shellfish. Also, no one can be allergic to molecular iodine. You can take the vitamin. ...Read more

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What do I have to do before my thyroid scan?

What do I have to do before my thyroid scan?

If hyperthyroidism: If you are having a diagnostic dose of i-123 (usually 200 microci), you should stop taking anti-thyroid medications (methimazole and ptu) and make sure you didn't have iodine-based IV contrast (used in ct scans) in the prior 6-8 weeks. For a diagnostic study a low-iodine diet is not require, unless you are going to received i-131 treatment shortly after the test. ...Read more

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What information do I have to bring along to do the thyroid scan?

Blood tests: It is helpful to bring along any recent thyroid function tests, such as a TSH level. Also, any recent x-rays, such as a ct scan utilizing contrast could affect the scan. What has your diet been? This may be helpful, especially if you've been eating lots of seafood. Why are you getting the scan? Any information regarding the clinical question being asked would be helpful. ...Read more

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What does a thyroid scan do?

What does a thyroid scan do?

Thyroid scan: It's a nuclear medicine scan use to evaluate how well your thyroid is working. The result will give information on the size, shape, location and the overall activity of the gland. It can also tell you if a thyroid nodule is functioning or non-functioning and help your doctor determine whether a nodule biopsy is needed. More info with the link below: http://www.Webmd.Com/a-to-z-guides/thyroid-scan. ...Read more

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How long does a thyroid scan test take?

How long does a thyroid scan test take?

Varies: A thyroid uptake and scan may be done with different isotopes and protocols resulting in scan time variation. Typically is done with i-123; you take the capsule one day and you come back the next day at 24 hr for a neck scan that takes aprox 15-20 minutes. In certain circumstances some places do this scan at 4-6 hours after you take the capsule. ...Read more

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What's the purpose of thyroid scan?

A thyroid scan: Uses a radioactive tracer and a special camera to measure how much tracer the thyroid gland absorbs from the blood. A thyroid scan can show the size, shape, and location of the thyroid gland. It also finds areas that are overactive or underactive and to evaluate possible masses that may be felt or seen with ultrasound. ...Read more

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Thyroid Scan (Definition)

The patient ingests radioactive iodine or has intravenous injection of radiotracer technetium to define structure, size, and function of thyroid gland. Overactive ( hyperthyroid) normal, and underactive thyroid glands are determined. Sometimes autoimmune conditions and tumors of the gland can be suspected. Correlative imaging ultrasound, mr imaging, and blood tests ...Read more


Dr. Oscar Novick
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Thyroid (Definition)

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