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Approach to a patient with hypotonic hyponatremia, Uosm > 100 mOsm/kg, and hematologic disease. Uosm: urine osmolality, TSH: thyroid-stimulating hormone, CRE: creatinine, COR: cortisol, CSWS: cerebral salt wasting syndrome, SIADH: syndrome of inappropriate antidiuretic hormone secretion, CNS: central nervous system.
