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Preparation Guidelines

99mTc Thyroid Scintigraphy

Patient Guidelines

PREPARATION:

Absolute fasting is not necessary.
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.
Medications to be suspended:
For 15 days: Triiodothyronine (T3).
For 30 days: Levothyroxine (Puran T4, Synthroid, Levoid, Euthyrox).
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 SUSPENDED UNDER SUPERVISION FROM THE ATTENDING PHYSICIAN;
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;
The patient will be asked to take TSH, thyroglobulin and anti-thyroglobulin antibody tests, which must be collected in the days prior to the exam. Check the laboratory for the expected result delivery time, as the therapy will only be performed upon the result of these tests.
Do not forget to bring any imaging exams you have (such as a thyroid ultrasound).
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 THE EXAM PERFORMED?

After filling out the registration form at the reception, the patient will undergo a brief clinical interview to check their data and exam preparation. Then, they will be sent to the injection room, where a small amount of radioactive material will be injected into a vein, preferably one from the forearm.

The patient will be instructed to wait 20 minutes in the waiting room. After this period, the patient will be sent to the examination room, where they will be positioned on the device’s gurney, and should remain lying down for about 15 to 20 minutes, without moving. During this period, thyroid images will be acquired.

The acquisition time may be shorter, depending on the amount of tracer retained in the thyroid.

At the end of the exam, the patient will be discharged without any restrictions, being able to resume routine medications and normal diet.

OE 016 – Version: 07/2024

Made by: DIMEN Technical Team