Thyroid Panel - Thyroid Panel (Thyroid Function Test)...

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Thyroid Panel (Thyroid Function Test) Description Thyroxine (T4), tri-iodothyronine (T3) resin uptake, and free thyroid index or free T4, T3 radioimmunoassay, or free T3 Cuffed venous blood sample, may be combined with TSH Advantages/disadvantages Advantage: confirms the hyperthyroid state. Normal Serum T4: 4-11mcg/dL (51-142nmol/L) Serum T3 resin uptake: 25-35% (0.25-0.35) Serum T3: 75-220ng/dL (1.2-3.4nmol/L) Free T4: 0.9-2.0ng/dL (12-26pmol/L) Free T3: 0.2-0.52ng/dL (3-8pmol/L) Abnormal Keep in mind the possibility of a false-negative result. Cause of abnormal result In hyperthyroidism, elevated serum T4 and T3 result from autonomous thyroid hormone production by the thyroid gland. Medications, disorders and other factors that may alter results Confirm that the patient is not taking thyroid hormone since overzealous use of thyroid hormone or suppressive therapy will result in an elevated T4 Estrogen, pregnancy, familial syndromes, and liver disease will increase
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Thyroid Panel - Thyroid Panel (Thyroid Function Test)...

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