The nurse is reviewing the laboratory results for a client who is receiving torsemide 5 mg orally daily. What value should indicate to the nurse that the client might be experiencing an adverse effect of the medication?

Torsemide is a loop diuretic. The medication can produce acute, profound water loss; volume and electrolyte depletion; dehydration; decreased blood volume; and circulatory collapse. Option 3 is the only option that indicates electrolyte depletion because the normal potassium level is 3.5 to 5.0 mEq/L (3.5 to 5.0 mmol/L). The normal chloride level is 98 to 107 mEq/L (98 to 107 mmol/L). The normal sodium level is 135 to 145 mEq/L (135 to 145 mmol/L). The normal BUN level ranges from 10 to 20 mg/dL (3.6 to 7.1 mmol/L).