Mt Whitney Zone Forums General Discussion AMS at 10,000 feet

I vomited at Upper Boy Scout Lake early July, but ~45 minutes later I felt great and we continued up Mt. Russell.

I had acclimated the night before at the portal campground.

Are there any tell tale signs that you should turn around and descend?

A guy in a group that went up Mt. Whitney last year brought along a device that measures altitude sickness but I forget what it was called or how it works.

edit: I asked him. It was a pulse oximeter.