Clinical Medical Assistant Exam Practice Question
Why is 70% isopropyl alcohol commonly used as an antiseptic for venipuncture instead of 100% isopropyl alcohol?
Correct Answer: B
Rationale: 70% isopropyl alcohol is preferred as an antiseptic for venipuncture due to its optimal balance of efficacy and safety. The presence of water in the 70% solution enhances penetration and allows for better microbial cell disruption, making it more effective at killing bacteria than 100% isopropyl alcohol, which evaporates too quickly to achieve maximum effectiveness.
Option A is incorrect; both concentrations can cause similar levels of discomfort. Option C is misleading; allergic reactions can occur with any concentration. Option D, while true in some contexts, does not specifically justify the use of 70% alcohol over 100% in medical settings.
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