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Doctor insights on: How Long Does Iodine Stay In Body When Had With Ct Scan

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Dr. Ihab Ibrahim
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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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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?

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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Do hospitals supply iodine pills before a CT scan?

No: It's not necessary. The amount of radiation is small. ...Read more

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If I am allergic to topical iodine, can I have intrevenous iodine for a CT scan with no reaction?

If I am allergic to topical iodine, can I have intrevenous iodine for a CT scan with no reaction?

Maybe: Ct contrast agents is usually iodinated and are classifed as either ionic or non-ionic. Some are more allergy-prone than others. Ct scan contrast is totally different than MRI contrast. In contrast, MRI contrast agents usually contains chelated gadolinium. Tell the radiologist about your previous ct scan contract allergic symptoms when getting your mri. ...Read more

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

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

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Hi, can iodine CT scan miss 2 CM aneurysm ? I guess it can seem a weird question with a obvious no but i d like to be sure. Thanking you in advance.

Hi, can iodine CT scan miss 2 CM aneurysm ? I guess it can seem a weird question with a obvious no but i d like to be sure. Thanking you in advance.

Brain Aneurysm: I assume you mean brain aneurysm, in which case the answer is no. A 2cm aneurysm is very large and will be easily detected by contrasted ( or non/contrast) ct scan. If by chance you are mistaken and mean 2millimeter, not centimeter, it is very easy for a ct to miss. ...Read more

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Did my CT scan said to drink 6-8 glasses of water for the next 3 days to clear my system from iodine, what happens if i don't? Not a water person..

Did my CT scan said to drink 6-8 glasses of water for the next 3 days to clear my system from iodine, what happens if  i don't? Not a water person..

Xray "dye" & water: Any time u have an imaging study like ct scan where contrast ("dye") is used it is recommended to flush the kidneys with plenty of water for next few days to prevent damage to the kidney filtering system. ...Read more

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I have allergy to iodine and gastrografin needed for CT scan. Is it safe?

Yes, but...: Reactions to contrast are usually not caused by a true allergy to iodine (which is rare). Low-ionic strength contrast should be used if you have a history of reactions to contrast, and the radiologist will give you antihistamines and corticosteroids (prednisone) before the test to help prevent a reaction. With this regimen, scans are usually very safe. Talk with the radiologist about your concerns. ...Read more

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I did a ct scan with iodine would that show an unruptured brain aneurysm ?

I did a ct scan with iodine would that show an unruptured brain aneurysm  ?

Maybe: Depending on the size and location of the aneurysm, it can be detected with a CT scan with iodine. However, brain aneurysms are detected more frequently and with smaller sizes with CT or MR angiography techniques. ...Read more

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How normal would it be for my left kidney to be sore after an iodine injection for a CT scan?

No: If there is a blockage of the kidney's urine drainage the the increased urine flow from the contrast injection can provoke grater distension of the renal collecting system which could well cause soreness. Let your doctor know about this to check for any compromise of your urinary drainage from a stone or ureteral stricture. ...Read more

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I have allergy to iodine. Gastrografin needed for CT scan. Is it safe for me to take?

No: If you have iodine allergy, you will need to premedicate with benedryl and possibly solumedrol (methylprednisolone). You do not "need" gastrografin for your study. You can drink barium and this will be safe for you. ...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?

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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What to do if I have allergy to iodine ( lugols/surg prep.) gastrografin needed for CT scan. is it safe for me to take?

Allergy: It probably wouldn't be cross reactive with gastrograffin because the allergy is not really to the iodine atom. However, if there is concern, there are alternatives to gastrograffin. For example, a diluted barium preparation, which contains no iodine, is perfectly appropriate as a CT oral contrast agent under most circumstances ...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

Dr. Michael Gabor
1,844 doctors shared insights

Ct Scan (Definition)

Ct scan uses data from a beam of xrays and reconstructs a cross sectional image of your body. It is a high dose of xrays and used only when the benefits outweigh the risk. Cancer risk is 1 in 500 in children. Also using iodinated contrast might cause transient renal failure in about 5% of patients. (contrast induced nepropathy) most do not explain this to the patient as ...Read more