A client is receiving intravenous (1V) vancomycin and the nurse plans to draw blood for a peak a

A client is receiving intravenous (1V) vancomycin and the nurse plans to draw blood for a peak a. trough to determine the serum level of the drug. Which collection times provide the best determination of these levels?

A.
Thirty minutes into the administration of the IV dose and 30 minutes before the next administration of the medication.

B.
Two hours after completion of the IV dose 2nd 00 0000 before the next administration of the medication.

C.
One how after completion of the IV dose and one hour before the next administration oldie medication.

D.
Immediately after completion of the IV dose and 30 minutes before the next administration of the medication.

The correct answer and Explanation is :

The correct answer is B. Two hours after completion of the IV dose and 30 minutes before the next administration of the medication.

Here’s why:

1. Peak Level: The peak level of a medication is typically drawn to measure the highest concentration of the drug in the blood, which reflects how well the drug is being absorbed. For intravenous (IV) drugs like vancomycin, the peak level is usually measured 1 to 2 hours after the completion of the IV infusion. This is because vancomycin reaches its highest concentration in the blood shortly after the infusion ends, and waiting too long may lead to a misleadingly low peak level.
2. Trough Level: The trough level represents the lowest concentration of the drug in the blood, indicating how much of the drug remains in the system before the next dose is administered. For vancomycin, the trough level should be measured just before the next dose is due to ensure it is within the therapeutic range. This timing helps assess if the drug levels are adequate to prevent bacterial resistance while avoiding toxicity.

In summary:

• The peak level for vancomycin should be drawn 1 to 2 hours after the end of the IV infusion to capture the highest concentration.
• The trough level should be drawn 30 minutes before the next dose to determine the lowest concentration and ensure it is in the therapeutic range.

Option B provides the correct timing for both levels:

• The peak level is drawn two hours after the IV dose completion.
• The trough level is drawn 30 minutes before the next dose.

Proper timing of these levels is crucial for optimizing the efficacy and safety of vancomycin therapy.