Pharmacology Proctored ATI Practice Exam 2025 – Comprehensive Test Prep

When obtaining an accurate gentamicin serum level, the nurse should draw a trough level immediately prior to administering the medication. This timing ensures that the lowest concentration of the drug in the patient's bloodstream is captured, which is important for monitoring and adjusting dosages to prevent toxicity while maintaining therapeutic levels. Drawing the trough level right before administration helps healthcare providers make informed decisions about the medication regimen. Option A (30 minutes before administering the medication) would not provide an accurate trough level as it would be too early. Option C (1 hour after administering the medication) and option D (immediately after administering the medication) are incorrect as they do not capture the trough level accurately.