a) Demonstrating a normal serum osmolality in the presence of hyperlipidemia or hyperproteinemia;
b) Demonstrating a significant ( >10 mmol/kg) osmolar gap, indicating the presence of additional osmotically active solutes, which can falsely lower the serum sodium level;
This is done by having the lab measure serum osmolality
Original Text by Clifford R. Wheeless, III, MD.
Last updated by Data Trace Staff on Wednesday, September 5, 2012 3:47 pm