THYROID CLINICAL APPLICATIONS:1.ASSESSMENT OF THYROID NODULES. 2.DIAGNOSES OF CAUSE OF THYROTOXICOSIS. 3.ASSESSMENT OF GOITER. 4.EVALUATION OF ECTOPIC THYROID. 5.ASSESSMENT OF THYROID CANCER. MEDICATION WHICH CAN LOWER IODINE UPTAKE. -ANTITHYROID MEDICATIONS (E.G., PROPYLTHIOURACIL,TAPAZOLE, THYROID HORMONES (T3), (T4)) -ORAL IODIDES AND MEDICATIONS WHICH CONTAIN IODINE (E.G., LUGOL'S SOLUTION, POTASSIUM IODIDE, KELP PREPARATIONS, MANY VITAMIN PREPARATIONS, ANTIPARASITIC DRUGS) -RADIOGRAPHIC IODINATED CONTRAST MEDIA. -THYROID REPLACEMENT MEDICATION (E.G., THYROID EXTRACT,TRIIODOTHYRONINE) NORMAL UPTAKE VALUES OF 123I FOR OUR DEPARTMENT 3 HR = 5% TO 10% 24 HR = 7% TO 20% NORMAL UPTAKE VALUES OF 99mTcO4 FOR OUR DEPARTMENT 30 MIN = 0.4% TO 3.0% NORMAL RIA VALUES (TRIIODOTHYRONINE) T3 = 0.7 TO 2.1 ng/ml (FREE TRIIODOTHYRONINE) FT3 = 3.0 + 0.5 PG/ML (THYROXINE) T4 = 5.0 TO 13.O mg/dl (FREE THYROXINE) FT4 = 1.6 + 0.6 ng/dl (THYROID-STIMULATING HORMONE) TSH = 0.2 TO 4.0 wu/ml PREPARATION - 1WEEK PRIOR EXAMINATION PATIENT SHOULD STOP EATING FOOD ENRICHED OF IODINE. (SUCH AS SEA FOOD) - 1MONTH PRIOR EXAMINATION PATIENT SHOULD STOP TAKEN THYROID MEDICATION. - X-RAY OR CT SCANS WITH CONTRAST MATERIAL SHOULD NOT BE PERFORMED (2-4) WEEKS PRIOR THYROID SCANS AND UPTAKE. * THYROID-USEFUL TIPS * *THYROID IMAGING INTERPRETATION* * ENDOCRINE * |