After reviewing a patient's laboratory values, the nurse determines the patient is experiencing fluid volume deficit. The laboratory value that would support this determination would be
1. urine osmolality 250 mOsm/L.
2. urine osmolality 1500 mOsm/L.
3. serum sodium 140 mEq/L.
4. serum potassium 4.3 mEq/L.
2
Rationale: Normal urine osmolality is 300 to 1200 mOsm/L. The urine osmolality will increase during fluid volume deficit because the kidneys hold onto water. This is the laboratory value that indicates the patient is experiencing fluid volume deficit. Urine osmolality decreases during fluid volume excess as the kidneys excrete more water. Both the serum sodium and serum potassium levels are within normal limits and would not help determine if the patient is experiencing a fluid volume deficit.
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