I ran across this article by accident. A nurse practitioner diagnosed HKPP in an 18 year old male who arrived in the ER unable to walk. He was lucky (I say that ironically) that his potassium was so low. Otherwise, they may not have known what was going on or believed him at all.
I'm glad the NP acknowledges that it's hard to diagnose HKPP because potassium doesn't always fall below "normal". I am one of those people, and the fact that my potassium doesn't always drastically fall out of "textbook" range is why I was untreated and mistreated for so many years. I am permanently weak at a younger than average age because of this.
I hope people will continue to bring awareness of all of the facets of this rare disease, so everyone who has it will be diagnosed and treated properly.
(Cross-posted to my medical blog at The Fight Against Hypokalemic Periodic Paralysis)