In clinical trials, for the detection of thyroid remnants or cancer in ablated patients using a thyroglobulin assay with a lower limit of detection of 0.5 ng/ ml, Thyrogen-stimulated thyroglobulin levels of 3 ng/ ml, 2 ng/ ml and 1 ng/ ml corresponded with thyroglobulin levels after withdrawal of thyroid hormone of 10 ng/ ml, 5 ng/ ml and 2 ng/ ml, respectively.