To ensure patient safety and medication effectiveness, the blood levels of many therapeutic drugs are monitored. The specimens that are typically drawn to do this are:

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Trough levels are drawn before the next dose is given to ensure that drug levels are not too low, while peak levels are drawn after the dose is given to ensure that drug levels are not too high. This allows for the dosing schedule to be adjusted as needed to optimize therapeutic drug levels while minimizing toxicity.

To Ensure Patient Safety and Medication Effectiveness, the Blood Levels