The nurse must monitor the trough level of medication.
When would the nurse order the trough level?
4 hours before the next scheduled dose.
24 hours after the drug was given.
30 minutes before the administration of the drug.
1 hour after the medication has been infused.
The Correct Answer is C
Choice A rationale
Ordering a trough level 4 hours before the next scheduled dose would likely result in an inaccurate reading. The trough level represents the lowest concentration of a drug in the bloodstream, typically occurring just before the next dose, ensuring that the drug concentration remains within the therapeutic range to exert its pharmacological effect.
Choice B rationale
Obtaining a trough level 24 hours after the drug was given is too late and would not provide an accurate assessment of the drug's lowest concentration before the subsequent dose. By this time, depending on the drug's half-life, the concentration may be significantly lower or undetectable, making it irrelevant for therapeutic monitoring.
Choice C rationale
The trough level of a medication is measured to ensure that the drug concentration remains above the minimum effective concentration and below toxic levels. Collecting the blood sample 30 minutes before the administration of the next dose allows the drug to reach its lowest concentration in the systemic circulation, providing an accurate representation of the drug's true trough level.
Choice D rationale
Measuring the drug level 1 hour after the medication has been infused would represent a concentration much closer to the peak level, not the trough. The peak level indicates the maximum drug concentration, typically occurring shortly after administration or infusion, and is used to assess for potential toxicity or adequate absorption.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["2590/2000"]
Explanation
INTAKE:.
Step 1: Jevity (Tube feeding) 50 mL/hr × 12 hours = 600 mL.
Step 2: oz free water tube feeding flush. Convert ounces to milliliters: 6 oz × 30 mL/oz = 180 mL.
Step 3: units of PRBCs (250 mL/each) = 2 × 250 mL = 500 mL.
Step 4: Zosyn IV 50 mL.
Step 5: oz ice chips. Convert ounces to milliliters (ice chips are typically calculated as half their volume in liquid): 4 oz × 30 mL/oz = 120 mL; 120 mL ÷ 2 = 60 mL.
Step 6:.9% NS 100 mL/hr × 12 hours = 1200 mL.
Step 7: Total Intake = 600 mL + 180 mL + 500 mL + 50 mL + 60 mL + 1200 mL = 2590 mL. OUTPUT:.
Step 1: NG Suction: 50 mL.
Step 2: Urine: 1850 mL.
Step 3: Wound vac: 100 mL.
Step 4: Total Output = 50 mL + 1850 mL + 100 mL = 2000 mL. Answer: INTAKE: 2590 mL / OUTPUT: 2000 mL.
Correct Answer is ["2"]
Explanation
Step 1 is convert grams to milligrams. 1 g = 1000 mg.
Step 2 is calculate how many milliliters will the nurse administer. 800 mg ÷ (1000 mg ÷ 2.5 mL) = 800 mg ÷ 400 mg/mL = 2 mL.
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