Low-Risk LevelUDT every 1-2 yearsState drug monitoring program - 2x per year 
Medium-Risk LevelUDT every 6-12 monthsState drug monitoring program - 3x per year
High-Risk LevelUDT every 3 monthsState drug monitoring program - 4x per year

From: NP Safe Prescribing of Controlled Substances While Avoiding Drug Diversion

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