​Differential diagnosis of diabetes insipidus

​Differential diagnosis of diabetes insipidus 
-excessive fluid intake due to CNS sarcoidosis, iv fluids, psychogenic polydipsia 
-Polyuria from Cushing’s syndrome, lithium or glucocorticoids, 
-osmotic diuresis such as diabetes mellitus 
-nephrogenic diabetes insipidus 
-central diabetes insipidus