How do Americans generally refer to kilograms in casual parlance? "Kilogram", "kilo", by the initialism kg ("kay-gee") or some other word?

Posted by cavendishfreire@reddit | AskAnAmerican | View on Reddit | 284 comments

I work in remote medical interpretation, which involves translating to and from American English. I'm never sure what word seems more natural to refer to kilograms in casual parlance. What do you guys think?