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Psuedohyponatremia: Criteria

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