Natriumjodid (131j) Diagnostik Ge Healthcare Buchler (Sodium Iodide (131i))

Natriumjodid (Sodium Iodide) is used in the diagnostic pathway for thyroid disorders, providing functional and anatomical information through nuclear imaging.

• Thyroid imaging: enables high‑resolution visualization of thyroid size, shape and nodules.
• Hyperthyroidism assessment: helps quantify iodine uptake to guide treatment decisions.
• Thyroid cancer surveillance: detects residual or metastatic thyroid tissue after surgery or radioiodine therapy.
• Congenital hypothyroidism screening: supports early detection of thyroid dysfunction in newborns.
• Post‑treatment follow‑up: evaluates thyroid function after therapeutic radioiodine administration.

• After oral administration, the radioactive iodine-131 in sodium iodide is selectively taken up by thyroid follicular cells via the sodium‑iodide symporter. The emitted beta particles provide a localized radiation source that allows gamma camera imaging, while the gamma emissions are detected to generate quantitative images of thyroid tissue distribution and function.

Adverse reactions may occur following oral administration of I‑131 sodium iodide. Most are mild and transient, but rare serious events have been reported.

Common Side Effects

• Nausea or mild vomiting.
• Metallic or altered taste sensation.
• Transient abdominal discomfort.
• Headache or mild fatigue.
• Mild leukopenia or temporary reduction in white blood cells.
• Skin erythema at the oral mucosa.

Serious or Rare Side Effects

• Severe allergic reaction or anaphylaxis.
• Acute radiation thyroiditis causing painful swelling.
• Significant hypothyroidism requiring hormone replacement.
• Bone marrow suppression leading to pancytopenia.
• Persistent gastrointestinal ulceration.
• Unexplained persistent fever or infection.

Use of Natriumjodid requires careful assessment of patient condition and adherence to radiation safety guidelines.

• Pregnancy: avoid use; potential fetal radiation exposure.
• Breastfeeding: contraindicated; iodine can be secreted in milk.
• Thyroid function: confirm baseline thyroid status before administration.
• Iodine load: discontinue high‑dose iodine supplements prior to dosing.
• Radiation protection: advise patients on minimizing close contact with others, especially children and pregnant women, for 24‑48 hours.
• Store below 25°C: keep in the original container, protect from moisture and direct sunlight.

Iodine‑131 sodium iodide may interact with other agents that affect iodine metabolism or radiation exposure.

Major Interactions (Avoid)

• High‑dose iodine supplements or contrast agents: can block thyroid uptake and reduce diagnostic accuracy.
• Concurrent therapeutic radioiodine treatments: may lead to cumulative radiation dose.

Moderate Interactions (Monitor Closely)

• Antithyroid medications (e.g., methimazole, propylthiouracil): may alter iodine uptake.
• Lithium therapy: can increase thyroid iodine retention.
• Certain antibiotics (e.g., amiodarone): contain iodine and may affect imaging results.