Suggested workup for a newly diagnosed or suspected LCH in adults. ACTH, adrenocorticotropic hormone; CBC, complete blood count; DI, diabetes insipidus; EKG, electrocardiogram; FSH/LH, follicle stimulating hormone/luteinizing hormone; HEENT, head, eyes, ears, nose, and throat; IGF-1, insulin-like growth factor 1; TSH, thyroid-stimulating hormone.