or absence of malignant disease. TSH 1.680 u/U/mL 0.450 - 4.500 02 vitamin D, 25-Hydroxy 41.4 ng/mL vitamin D deficiency has been defined by the Institute of 30.0 - 100.0 02 Medicine and an Endocrine Society practice guideline as a level of serum 25-0H vitamin D less than 20 ng/mL (1,2). The Endocrine S