Step Seven is about cleansing the client’s finger.

Step Seven Video Narration:

After the client's hands are warm, it's now time to cleanse the site with an alcohol wipe. After wiping the site several times, dry the site with gauze or a lint-free wipe. Never blow on the skin to dry the alcohol. Excess alcohol on the skin will dilute the sample and hemolyze the red blood cells, which means they will burst open, and give you a false reading.

If the client has washed her hands with soap and water in the lab, do not use an alcohol wipe. Alcohol cools the skin causing the blood vessels to constrict, thereby reducing the flow of blood.

Once the site is clean, the client must not touch anything, until after the test.