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If > 20 meq/L: Renal salt wasting. If < 10meq/L: Avid sodium retention due to extrarenal Sodium wasting. Isotonic Hyponatremia: Hyperlipidemia and hyperproteinemia ( displaces water ( Decreased sodium conc. In total plasma volume. Hypertonic Hyponatremia: Seen with hyperglycemia, water drawn from cells into extracellular space when blood ... ................
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