From the 2013 guidelines of the European Thyroid Association on thyrotropinoma diagnostic recommendations, we were able to conduct most of the recommended laboratory tests with high to moderate quality of evidence, except for the TRH stimulation test, T3 suppression test, α-GSU (alpha-subunit of glycoprotein hormones), α-GSU/TSH ratio, and ICTP (type I collagen carboxy-terminal telopeptide) [18]. Here, TRH is linked to TSH-secreting pituitary adenoma.