A client is admitted with nausea, weakness, and confusion af…

A client is admitted with nausea, weakness, and confusion after excessive water intake. The lab results are: Sodium: 118 mEq/L (Normal: 136–145) Serum osmolality: 260 mOsm/kg (Normal: 280–295) Urine specific gravity: 1.002 (Normal: 1.005–1.030) Which nursing intervention has the highest priority?