Last week I posted a tweetorial on pseudohyperkalemia due to CLL and a high white blood cell count.
This case peaked with a potassium of 9.5. Pretty frightening, but that was nothing compared to the potassium of 15.5 I saw in 2014. Details here.
I had another case of pseudohyperkalemia in 2011. That one was due to thrombocytosis.
In response to my Tweetorial, Yash Chivate shared a case of pseudohyperkalemia of his own.