I have and continue to do so... BUT...
Last school year I lived in a small village. DH would walk up with DS, then we'd go over to the clinic together. We lived the equivalent of a city block from my work, and it was another city-block-equivalent to the clinic.

This year, it's a bit further (seven minute drive from home for him to come pick me up, less-than-five minute drive to the clinic), but we continue to do so since my boss says that such things don't even need to be counted into sick leave unless they take longer than an hour and are infrequent (and now that he's not an itty-bitty anymore, they are infrequent).
Also, DH is not comfortable being *the* parent at an exam. He'll do it, and has done it when necessary, but prefers not to, for a variety of personality-based reasons. He has many, many strengths, being *the* parent at the doctor isn't one of them.
In another situation, I'd probably say no, he could do them himself. But we've lucked into a a very flexible work situation for me, and so we take advantage of it.