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Doctor insights on: Ct Iodine Contrast

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Is it common to administer iodine CT contrast orally AND through IV for the same test and why would they do that?

Is it common to administer iodine CT contrast orally AND through IV for the same test and why would they do that?

Yes: The oral contrast shows the intestines on X ray and the injectable contrast shows the vessel system on X ray. ...Read more

Dr. Dariush Saghafi
1 doctor shared a insight

Computed Tomography (Definition)

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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I've had 3 CT scans with iodine contrast (my third one I had today) & multiple MRI's with contrast. Will this damage my kidneys?

I've had 3 CT scans with iodine contrast (my third one I had today) & multiple MRI's with contrast. Will this damage my kidneys?

Contrast OK but CT: exposure might be a little too much. Each time you get contrast, your kidneys will easily excrete it. As long as the doses are separated by a day or more, it won't hurt your kidneys. At only 19, you should talk to your doctor about ways to reduce the number of CTs to limit the ionizing radiation. MRIs and Ultrasounds have no ionizing radiation and are considered low risk for future cancer. ...Read more

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I take 5 mg of methimazole daily for hyperthyroidism. what do I do before or after a CT scan with iodine contrast?

I take 5 mg of  methimazole daily for hyperthyroidism.  what do I do before or after  a CT scan with iodine contrast?

Iodine hyperthyroid: The iodine load of a CT scan can sometimes stimulate the thyroid to make more T4 and T3 (liothyronine) and worsen hyperthyroidism. But it probably will not, especially if your hyperthyroidism is controlled and you are taking your methimazole. Talk to your doctor. You may want to get your thyroid blood level checked about 2-4 weeks after the CT scan. ...Read more

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After CT scan what is duration of contrast medium (iodine) in body?

After CT scan what is duration of contrast medium (iodine) in body?

Are you sure.: If radio active iodine is used it is i-131 which has half life of less than 9days, then calculate every 9 days half of it will be eliminated in the body with i -131. Not bad if we did not synthesize i- 131 imagine if it is i- 129 which had half life of 15.7 million years. ...Read more

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Can iodine contrast used for CT scan inadvertently improve symptoms or issues?

Probably not: I like to keep an open mind but there is no scientific evidence that contrast used for CT can be used to treat disease. If you are feeling better after a CT exam, it is likely that you were on your way to getting better before the scan and the improvement continued after the scan to a point that you then noticed it. ...Read more

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Is it possible to become allergic to the iodine contrast used for CT scans if i continuously have them? Does frequency matter?

Iodine sensitivity: Yes it is possible. If you every think you do have a reaction, you should report it immediately and not get the iodine dye again. ...Read more

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What is an alternative to iodine used in CT with contrast? Say, someone is allergic to shellfish....What is an alternative contrast to use?

Reaction to contrast: Contrast media reactions are often described as allergy but in truth are not allergy. The high concentration of the contrast can shock cells called basophils into releasing their granules filled with histamine. This causes the same reaction as the histamine release due to allergy. Shellfish allergy has nothing to do with iodine or contrast. Low osmolality contrast & premedication helps. ...Read more

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Can you be allergy tested for iodine constrast dye before CT scan?

Not aware of testing: The risk of an adverse reaction to non ionic IV contrast dye is very low, less than 1 in 100 injections. Most of the reactions are mild and easily treated. Severe reactions occur in 1-2 per 10, 000 injections of IV non ionic contrast. If a person was severely allergic to many different things, perhaps a consultation with an allergist could be obtained. ...Read more