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1) lab work I wouldn't worry much about it. 2) blood donation sites get a surgical type prep with providine iodine solution. That is done to protect the donated blood and the 14 gauge needle stick site. A far cry from a 25 to 30 gauge injection site.

Lab work, I don't care about it. Blood donation is a whole differst matter to protect the recipient requires a betadine or equivalent skin prep and scrub.

(Note Bene, your mileage may vary.) 50 years as a Registered Nurse and Nurse Anesthesiologist, I seldom saw anyone follow the 30 second scrub and 30 second wait for the alcohol to evaporate prior to an injection. Typically swipe and inject in a few seconds. Never saw nor heard of an injected...