pseudohyponatremia

A low serum sodium concentration due to volume displacement by massive hyperlipidemia or hyperproteinemia; also used to describe the low serum sodium concentration that may occur with high blood glucose.

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pseu·do·hy·po·na·tre·mia (soo″do-hi″po-nə-treґme-ə) a decreased serum sodium concentration that does not correspond to a real hypotonic disorder, i.e., the serum osmolality is normal. It occurs when hyperlipidemia increases the serum non-water volume or hyperproteinemia increases the serum non-sodium solute.