:Normal range
mOsm 270-280: <1.5
mOsm 280-285: < 2.5
mOsm 285-290: 1.00-5.00
mOsm 290-295: 2.00-7.00
mOsm 295-300: 4.00-12.00
Comment: This test is used for confirming a diagnosis of diabetes insipidus or inappropriate ADH secreation. It should be carried out in conjunction with simultaneous plasma osmolality and sodium
Sample: Both plasma (EDTA) & serum should be sent under ice, freeze immediately, fasting