A nurse is preparing to administer furosemide (Lasix) to a client. Which of the following findings should the nurse hold the medication and notify the provider? (Select All That Apply.).

A. Urinary output of 80 mL/hour is not concerning and indicates adequate renal function. B. Urinary output of 12 mL/hour is very low and may indicate renal insufficiency or dehydration, requiring immediate intervention. C. A blood potassium level of 2.5 mEq/L is critically low and requires discontinuation of the diuretic to prevent life-threatening arrhythmias. D. A blood potassium level of 2.9 mEq/L is also low and would be concerning, though not as critical as 2.5 mEq/L. It may still necessitate withholding the medication and addressing electrolyte imbalances.