Ok, so we had the hearing test and follow-up with the ENT this afternoon. His hearing is completely normal; in fact, it was improved over the test he had 3 weeks ago. His ENT is comfortable leaving everything as is right now, unless my husband has a full day of ringing. In that case, we're to get another hearing test done and then the ENT will treat it with high-dose steroids and an antiviral (not antibiotics), probably Valtrex. He said that he's seen lots of folks going through the same dose of cisplatin and that in all likelihood this is a transient problem that will resolve.

We'll talk to the MO tomorrow and see what he says, but I suspect he'll agree with the ENT and we'll proceed with the next dose of cisplatin. It's not scheduled until January 2 so we have some time to see if the ringing stays intermittent or if he has an all-day episode.

Thanks for the input, everyone.