During therapy with amphotericin B, what lab result indicates an adverse effect?

Amphotericin B is an antifungal medication known for its potential nephrotoxicity and electrolyte imbalances as side effects. One significant adverse effect is hypokalemia, which is a low serum potassium level. A serum potassium level of 2.7 mEq/L is indicative of severe hypokalemia and poses a risk for various complications, including cardiac arrhythmias, muscle weakness, and other systemic issues.

This particular lab result directly correlates with the known side effects of amphotericin B, showcasing how its administration can lead to drastic decreases in potassium levels due to renal handling and other mechanisms affected by the drug, highlighting the necessity for regular monitoring of potassium levels during therapy.

In contrast, the other options represent normal lab values or minor variations that are not typically associated with adverse effects from amphotericin B therapy. A serum sodium level of 145 mEq/L is within normal ranges, a white blood cell count of 7,000 cells/uL is also normal and does not raise any concerns regarding adverse effects, and a blood glucose level of 100 mg/dL is normal as well.