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Doctor insights on: Do You Need To Be Npo Before A Thyroid Scan

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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


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Do you need to fast before a renal ultrasound?

Do you need to fast before a renal ultrasound?

No: no not unless thet are looking at the arteries of the kidneys also ...Read more

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You had your gallbladder removed, there a certain diet you need to follow?

You had your gallbladder removed, there a certain diet you need to follow?

Not really: You should be able to eat anything, within reason, without difficulty. Issues such as heartburn or indigestion are not a gall bladder issue. ...Read more

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Would you be able to see if a patient had throat cancer if doing an upper endoscopy? How sure can you be you don't have throat cancer when result neg?

Would you be able to see if a patient had throat cancer if doing an upper endoscopy? How sure can you be you don't have throat cancer when result neg?

Perhaps: An upper endoscopy is a fiberoptic procedure typically administered by a gastroenterologist. The patient is usually sedated and lying down. The goal of this procedure is to look at the upper GI tract. A better exam to evaluate for laryngeal or pharyngeal cancer is a flexible fiberoptic laryngosocpy. This is performed by an head and neck surgeon. It is a smaller scope passed through the nose. ...Read more

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Do you need to fast before getting a thyroid n cvc test?

Do you need to fast before getting a thyroid n cvc test?

No: You do not need to fast for a thyroid blood test. I don't know what you mean by "cvc" test. Do you mean a "cbc", which is a complete blood count. You don't need to fast for that either. ...Read more

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How much do you need to drink to have a full bladder during an ultrasound?

How much do you need to drink to have a full bladder during an ultrasound?

32 ounces water: Typical instructions are to drink 32 ounces of water and be finished drinking one hour prior to exam. Cannot urinate until after exam. ...Read more

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What tests do you need to have done to figure out if you have hypo or hyperthyroidism?

What tests do you need to have done to figure out if you have hypo or hyperthyroidism?

Lab tests: The common tests for both condition are: TSH and free t4. For hyperthyrodism, you will also need a free t3 (liothyronine). Once your doctor has these results, more tests might be needed such as thyroid antibodies, thyroid ultrasound, thyroid uptake and scan and possibly thyroid biopsy. The latter tests are usually not needed if tsh, free T4 and free T3 (liothyronine) are normal. ...Read more

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Why would thyroid panels need to be done in linear dilution to find hypo. thyroid issues? Mom had to have this if not her disease didn't show up?

Why would thyroid panels need to be done in linear dilution to find hypo. thyroid issues? Mom had to have this if not her disease didn't show up?

Hypothyroid diagnosi: This does not make sense. Most assays for FT4 and TSH have a broad range, and the diagnosis of hypothyroidism (low FT4, high TSH) is clear. If your mom's TSH was very high, maybe >150, they may have needed to dilute the sample, but it really doesn't matter if the TSH is 100, 200, or more. It's high. ...Read more

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If you went to see if you got osa from your primary care doctor she said to you absolutely you don't have sleep apnea but 2 weeks later you ?

If you  went to see if you got osa from your  primary care  doctor  she said  to you absolutely  you don't  have  sleep  apnea  but 2 weeks later you ?

R/O OSA: OSA can be suggested by history and physical. Excess snoring/daytime sleepiness/apneic episodes/ aM headaches. And the Exam obesity/small oral airway/collar size>18. The definitive test is a PSG with split night study and CPAP titration. I would request copy of sleep study and get a second opinion if you are not satisfied with the options. ...Read more

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Parathyroid tumor - if you had one removed, will you have to take meds like if you removed your thyroid?

Parathyroid tumor - if you had one removed, will you have to take meds like if you removed your thyroid?

No: Unlike the thyroid, people generally are born with 4 parathyroid glands. When one of them is removed, the other glands are still there to do the work. ...Read more

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Does a thyroid ultrasound test for hypothyroidism or do you need to give blood?

Does a thyroid ultrasound test for hypothyroidism or do you need to give blood?

Hypothyroid: The ultrasound does not test for function. Blood-work is needed. ...Read more

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What would happen if you were to drink liquids prior to a surgical procedure? Is it dangerous? Maybe an hour before

What would happen if you were to drink liquids prior to a surgical procedure?  Is it dangerous? Maybe  an hour before

Cancel operation: Not eating or drinking before a surgical procedure is required as there is a risk with anesthesia of emesis and aspiration of stomach contents. This can lead to a horrible pneumonia. Taking key medications (like blood pressure) with a sip of water is ok but check with your surgeon. ...Read more

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How should I be expected to fast for 8 hours to do lab work if i could possibly have insulinoma? I don't understand how considering the circumstances

How should I be expected to fast for 8 hours to do lab work if i could possibly have insulinoma? I don't understand how considering the circumstances

Opposite effect: I don't really know what is being tested but the problem with insulinomas are actually the drop in blood sugar after eating. The rise in blood sugar after eating causes the production and release of too much Insulin as a response to the rise in blood sugar. After fasting, the proinsulin, c peptide, blood sugar is tested and correlated and imaging may be done if suspected. ...Read more

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I have to get blood drawn tomorrow to see if i have a thyroid problem, will it be able to tell if I'm pregnant?

I have to get blood drawn tomorrow to see if i have a thyroid problem, will it be able to tell if I'm pregnant?

No. Different tests.: The urine or blood test for pregnancy is different than the thyroid tests. If worried about pregnancy, one can ask her doctor whether or not this is the right time to do a pregnancy test. Testing too soon won't give a reliable result. ...Read more

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I ve liver cysts,largest7 mm,do they need monitoring?can they grow in size?if so what period would you suggest after which second mri needs to be done

I ve liver cysts,largest7 mm,do they need monitoring?can they grow in size?if so what period would you suggest after which second mri needs to be done

Variable: This can vary from no follow up to imaging every 3-6 months. This depends on the type of lesions you have. Simple cysts can grow but are benign. They are only acted upon (such as unroofing) to drain if large AND causing symptoms but i don't want to assume you have such a cyst. You should see a GI doctor or liver specialist to discuss what follow up is needed ...Read more

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If I need hemodialysis, will I need to be seen by a specialist?

If I need hemodialysis, will I need to be seen by a specialist?

Yes: Dialysis is ordered by kidney specialist called nephrologist who will discuss various dialysis options and kidney transplant. ...Read more

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With a transvaginal ultrasound or bloodwork, will the doctor be able to tell if I've ovulated already ?

With a transvaginal ultrasound or bloodwork, will the doctor be able to tell if I've ovulated already ?

Usually: With an elevated Progesterone blood level or a collapsed follicle on ultrasound with some free fluid in the culde sac these signs usually signify ovulation. ...Read more

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I'm curious as to what tests need to be done before a chest surgery?

I'm curious as to what tests need to be done before a chest surgery?

Depends: Depends on the planned operation and your underlying health. There are some tests that are often done to assess risk and help in planning the operation. Routine labs and often an ekg are done. Almost always, pulmonary function tests are performed to assess lung capacity. If there are risk factors or symptoms present, it may make sense to do a stress test. ...Read more

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Dr. Jan Lei Iwata
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