PT  - JOURNAL ARTICLE
AU  - Kevin M. Pantalone
AU  - Christian Nasr
TI  - Approach to a low TSH level: Patience is a virtue
AID  - 10.3949/ccjm.77a.10056
DP  - 2010 Nov 01
TA  - Cleveland Clinic Journal of Medicine
PG  - 803--811
VI  - 77
IP  - 11
4099  - http://www.ccjm.org/content/77/11/803.short
4100  - http://www.ccjm.org/content/77/11/803.full
SO  - Cleve Clin J Med2010 Nov 01; 77
AB  - Confronted with a low serum level of thyrotropin (thyroid- stimulating hormone, TSH), physicians should not jump to the conclusion that it is due to a hyperthyroid state, as other conditions and some drugs can be associated with a TSH level that is slightly low (0.1–0.4 μIU/mL) or frankly suppressed (< 0.1 μIU/mL). This review discusses how to approach a low TSH, stressing the frequent need to reassess thyroid function before making a diagnosis, the underlying processes and the drugs that can be responsible, and the degree of TSH suppression and its role in the evaluation.