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I answered another posting like this in regards to contrast dye.
I would suggest that anyone who has to have contrast dye...print this out as the info is invaluable.
There are 2 types of contrast that they use for CT, MRI, X-Ray, RAIU.
************************************************************************************************************
MRIs and CT scans do not use radioactive dyes, but a non-radioactive
contrast media, usually gadolinium. (Gadolinium has no iodine, so it
causes few allergies.)
While SestaMIBI, used for stress testing, thyroid scans and mammograms, is radioactive.
To have a computed tomography scan (CT scan) done, you may need to have an injection of "contrast" or "dye." This liquid is visible on X-ray pictures or CT scans, so once it is injected it will cause your blood vessels to be visible to the radiologists. This makes your anatomy very clear. "Contrast" also can highlight areas with inflammation because blood flows more generously to inflamed areas.
The reason that contrast dye is visible on X-rays is because it contains highly concentrated iodine.
Some reactions to contrast dye are allergic, but the trigger for the allergy has not been precisely identified. Doctors have noticed that older dye preparations that have a high concentration of iodine are more likely to trigger a reaction. Contrast dye has been adjusted in a variety of ways in order to make it less likely to cause a reaction.
Iodine has not been removed from contrast dye, but the dye is now prepared so that the iodine is chemically "hidden" from your immune system. Your immune system does not detect the iodine easily since each iodine particle is packaged inside a complex salt.
The newer dye is called "non-ionic" or "low-osmolar" contrast.
You can ask your doctor to use one of the newer dyes, which while are more expensive, are far less allergenic.
You may also be prescribed an antihistamine of cortisone before the procedure to lessen the chance of an allergic reaction.
I am allergic to the Iodine based dye Pertechium so for my thyroid tests they used the newer one and I had no problems.
I had the same reaction as you did with previous tracers and felt like I was going to die!
Please ask your Doc for the 'low-osmolar' contrast.
I would suggest that anyone who has to have contrast dye...print this out as the info is invaluable.
There are 2 types of contrast that they use for CT, MRI, X-Ray, RAIU.
************************************************************************************************************
MRIs and CT scans do not use radioactive dyes, but a non-radioactive
contrast media, usually gadolinium. (Gadolinium has no iodine, so it
causes few allergies.)
While SestaMIBI, used for stress testing, thyroid scans and mammograms, is radioactive.
To have a computed tomography scan (CT scan) done, you may need to have an injection of "contrast" or "dye." This liquid is visible on X-ray pictures or CT scans, so once it is injected it will cause your blood vessels to be visible to the radiologists. This makes your anatomy very clear. "Contrast" also can highlight areas with inflammation because blood flows more generously to inflamed areas.
The reason that contrast dye is visible on X-rays is because it contains highly concentrated iodine.
Some reactions to contrast dye are allergic, but the trigger for the allergy has not been precisely identified. Doctors have noticed that older dye preparations that have a high concentration of iodine are more likely to trigger a reaction. Contrast dye has been adjusted in a variety of ways in order to make it less likely to cause a reaction.
Iodine has not been removed from contrast dye, but the dye is now prepared so that the iodine is chemically "hidden" from your immune system. Your immune system does not detect the iodine easily since each iodine particle is packaged inside a complex salt.
The newer dye is called "non-ionic" or "low-osmolar" contrast.
You can ask your doctor to use one of the newer dyes, which while are more expensive, are far less allergenic.
You may also be prescribed an antihistamine of cortisone before the procedure to lessen the chance of an allergic reaction.
I am allergic to the Iodine based dye Pertechium so for my thyroid tests they used the newer one and I had no problems.
I had the same reaction as you did with previous tracers and felt like I was going to die!
Please ask your Doc for the 'low-osmolar' contrast.
Hope that helps.