Which laboratory parameter must be monitored with metformin due to rare but serious toxicity risk?
QUESTION
Which two labs should be monitored after starting spironolactone for heart failure?
QUESTION
Which laboratory parameter is the primary monitor for digoxin toxicity risk in renal impairment?
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ANSWER
Serum digoxin concentration (plus renal function and potassium). Monitors drug accumulation in renal impairment, with hypokalemia exacerbating toxicity risks.