Figure 1From: Calcitonin estimation in patients with nodular goiter and its significance for early detection of MTC: european comments to the guidelines of the American Thyroid AssociationThe pentagastrin stimulation test for serum calcitonin: Panel A) example of a positive stimulation test with an increase from 16 to 98 pg/ml (6 times); panel B) example of a negative stimulation test with an increase from 16 to 28 (1.7 times). The broken line identifies the upper level of our institutional normal range (i.e 10 pg/ml).Back to article page