Final answer:
A 70% isopropyl alcohol solution is commonly used to clean the skin before a blood draw to ensure disinfection and reduce infection risk.
Step-by-step explanation:
In the medical setting, specifically during a blood draw, a 70% isopropyl alcohol solution is typically used for skin disinfection. This concentration of alcohol is effective at killing bacteria and provides a clean area to reduce the risk of infection during the blood draw procedure. Alcohol pads, commonly used in clinics and hospitals, are saturated with the 70% isopropyl alcohol solution for this purpose. While the context of the question initially seems related to alcohol metabolism in the human body, it's important to note that the alcohol used for cleaning in a blood draw is entirely different and is meant for external use only.