PTH and celiac disease: Laboratory tests for follicle-stimulating hormone (FSH), luteinizing hormone (LH), testosterone, DHEA sulfate (DHEAS), 17-0 H progesterone, adrenocorticotropic hormone (ACTH), cortisol, prolactin, thyroid stimulating hormone (TSH), free thyroxine (fT4), insulin-like growth factor-1 (IGF-1), parathyroid hormone (PTH), 25-hydroxy vitamin D (25(OH)D), 1,25-dihydroxy vitamin D (1.25(OH)2D), calcium, and phosphate, tissue transglutaminase IgA antibody (tTG IgA) for celiac disease and ferritin, were performed with no abnormal results.