The comparative value of serum thyroglobulin measurements and XXXX 131 total body scans in the follow-up study of @entity1 with treated @entity259 .

@entity1 @entity1496 @entity5 @entity3 @entity259
This study is an attempt to unify the evaluation of @entity1 with well- @entity259 after ablative therapy. As such serum thyroglobulin determinations on and off thyroid hormone (T4) therapy and @entity1496 131 total body scans were examined in 53 @entity1 studies. No @entity3 were found in @entity1 whose thyroglobulin value was undetectable (less than 1 ng/ml). Values during T4 therapy that were detectable, even as low as 4.2 ng/ml, were occasionally associated with @entity3 . After T4 withdrawal, thyroglobulin value and scan were obtained. Neither @entity3 nor clinically detectable @entity5 was found in @entity1 whose thyroglobulin value was less than 10 ng/ml while off T4. Conversely, a value greater than 10 ng/ml was often associated with documented @entity3 even when the scan was negative. In summary, a thyroglobulin value less than 1 ng/ml during T4 therapy or less than 10 ng/ml off T4 therapy suggests successful therapy and a routine scan could be avoided unless clinically indicated. However, a value greater than 10 ng/ml suggests the presence of @entity3 despite a negative scan. Thyroglobulin determination substantially improves the management of these @entity1 .
