Final answer:
Using povidone-iodine to cleanse a site for dermal puncture can lead to possible contamination and interfere with blood glucose test results.
Step-by-step explanation:
When a phlebotomist uses povidone-iodine to cleanse a site for a dermal puncture, it can affect the result of certain tests. One notable example would be the blood glucose test. Povidone-iodine may contain small amounts of iodine which could contaminate the blood sample and interfere with the test results, leading to false readings. Therefore, an antiseptic like alcohol that does not interfere with glucose measurements is typically recommended for cleansing the skin prior to blood glucose testing.