[Rain Man]

If you don't normally call in sick and you're doing it a lot, and then you come in fine in the intervening times, they probably already know that you're interviewing. Been there, observed that.

Anyway, there's not much you can do about it. If possible, you should be taking vacation days instead of sick days, because as an employer that's what would tick me off the most and cause my bridge to start burning. I recognize that you can't take vacation days impromptu in some jobs, though, and I don't know your situation.

If you get hired, you might mention this to them after a year or so of proving yourself, so it doesn't cause problems for future candidates. Your new company probably isn't thinking about it.

And as a final note, your friend can probably tell you about the culture, but as a job candidate I would make a negative note of this from a culture perspective. If they can't figure out that you have a job and are making you come in repeatedly during the middle of the day, that's really kind of rude and indicates that they aren't empathetic.