Hemolysis Interferes with the Detection of Anti–Tissue Transglutaminase Antibodies in Celiac Disease To the Editor: Detection of anti–tissue transglu- taminase (tTG) antibodies by the use of human recombinant or erythrocyte tTG-IgA– based ELISA

1. Biller BM, Grossman AB, Stewart PM, Melmed S, Bertagna X, Bertherat J, et al. Treatment of adrenocorticotropin-dependent Cushing’s syndrome: a consensus statement. J Clin Endocrinol Metab 2008;93:2454–62. 2. Yanovski JA, Cutler GB Jr, Chrousos GP, Nieman LK. Corticotropin-releasing hormone stimulation following low-dose dexamethasone administration: a new test to distinguish Cushing’s syndrome from pseudo-Cushing’s states. JAMA 1993;269:2232– 8. 3. Martin NM, Dhillo WS, Banerjee A, Abdulali A, Jayasena CN, Donaldson M, et al. Comparison of the dexamethasone-suppressed corticotropinreleasing hormone test and low-dose dexamethasone suppression test in the diagnosis of Cushing’s syndrome. J Clin Endocrinol Metab 2006; 91:2582–6. 4. Erickson D, Natt N, Nippoldt T, Young WF Jr, Carpenter PC, Petterson T, et al. Dexamethasonesuppressed corticotropin-releasing hormone stimulation test for diagnosis of mild hypercortisolism. J Clin Endocrinol Metab 2007;92:2972–6. 5. Pecori Giraldi F, Pivonello R, Ambrogio AG, De Martino MC, De Martin M, Scacchi M, et al. The dexamethasone-suppressed corticotropinreleasing hormone stimulation test and the desmopressin test to distinguish Cushing’s syndrome from pseudo-Cushing’s states. Clin Endocrinol 2007;66:251–7.