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Preparation Guidelines

Before Outpatient 131Iodine Dosage (Graves/Plummer)

Patient Guidelines

PREPARATION:

Absolute fasting of 6 hours.
Pregnancy should be ruled out, and it is necessary to bring the result of recent Beta-HCG (collected less than three days before the exam date) for women in the fertile period, not hysterectomized.
Breastfeeding should be permanently stopped for the current child if radioactive iodine therapy is necessary in this condition;
Medications to be suspended:
Antithyroid drugs should be withheld for 2 to 3 weeks for patients taking propylthiouracil (PTU) and for 2 days for patients taking methimazole (Tapazol). This period may be shorter, depending on the clinical condition of the patient to be evaluated and the urgency of the information;
For at least 90 days or at medical discretion, medicines that contain amiodarone as an active ingredient. In cases of prolonged use of this medication, the withholding time may be longer than this period;
Medications containing iodine, such as cough syrup, vitamins and vitamin supplements enriched with iodine or containing red dye (erythrosine) must be suspended for at least 30 days. Check the package insert or label of the medicine.
There are no limitations on the use of analgesics, antibiotics and anti-inflammatories, as long as they do not contain red dye (erythrosine);
Topical solutions and use of cosmetics: topical solutions containing iodine, such as Povidine, iodized alcohol, Schiller’s test (gynecological exam), as well as the use of red/pink lipstick (containing edible red dye – erythrosine) should not be used for at least 15 days;
MEDICATIONS SHOULD ONLY BE WITHHELD UNDER MEDICAL GUIDANCE;
Iodinated radiological contrasts should not be used for at least 30 days before the exam;
Avoid walks on the beach and bathing in the sea, in addition to using suntan lotions for 15 days before the exam. (sunscreens are allowed);
This test is not recommended for pregnant or breastfeeding women;
If you have any questions about medications, please contact our call center.

DIET:

1) The goal of the diet is to reduce as much as possible the amount of iodine that comes from food and drinks. This is necessary to increase therapeutic efficacy.

2) Check the product label if there is a reference to iodine or erythrosine dye in its composition or if there are any of the ingredients listed below.

3) Do not confuse sodium with iodine, for food or medicines that contain only sodium are allowed.

Foodstuffs that should not be consumed for 15 days prior to therapy.
Salt	All foodstuffs containing iodized salt (snacks, fried potatoes, cookies, etc.). Custom-ordered Non-iodized salt is allowed.
Fish and food from the sea	All seafood (oysters, fish, seaweed, shrimp, etc.). Freshwater fish is allowed.

Meat and derivatives	Smoked meat, sun-dried meat, meat broth, sausages (salami, bologna, mortadella, ham, bacon, sausage). All fresh meats are allowed.
Eggs, sauces, oils and seasonings	Egg yolk (egg whites are allowed), mayonnaise, soy oil and sauce, industrialized tomato sauce, ketchup, industrialized seasonings and broths (Sazon, Knorr, etc). Other seasonings, such as vinegar, olive oil, parsley, oregano, homemade tomato sauce, rosemary, thyme, corn/sunflower oil are allowed.
Fresh fruit	Strawberry, cranberry, blueberries.
Leaves and vegetables	Watercress, celery, Brussels sprouts, cabbage, artichokes, unpeeled potatoes and spinach.
Grains and flours	Soybeans and derivatives. Chestnuts, peanuts and salted nuts. Other grains (e.g., rice, beans, corn, wheat) and flour are allowed.
Canned goods and preserves	All canned vegetables (such as olives, pickles, sauerkraut, etc.), canned or syrupy candies and prunes.
Sweets and drinks	All chocolates, candies made with eggs and/or milk, candies and drinks containing red/pink dye. Instant or instant coffee, industrialized teas, coconut water and dark soft drinks. Natural juices and teas, clear soft drinks, light beer, and white wine are allowed. Vegan sweets, honey and molasses are also allowed.
Dairy	All milk of animal origin and its derivatives (butter, cheese, cottage cheese, yogurt, ice cream), soy milk and tofu (soy cheese). Other milks, such as oats, almonds, rice and unsalted margarine, are allowed.
Breads and pastas	Industrialized breads, pizza and all pasta made with eggs/milk.
Food Supplements	All food supplements (e.g. Whey protein, casein, creatine, etc.) should be suspended.

HOW IS THERAPY PERFORMED?

After the registration form is filled out at the reception desk, the patient will be sent to the office for an interview with one of our nuclear medicine physicians, who will advise on radioprotection measures, adverse effects and clarify any doubts.

Then, the patient will receive the dose of radioactive iodine, orally, and will be discharged with instructions to fast for another two hours.

OE 065- Version: 09/2024

Made by: DIMEN Technical Team