Does anyone know or remember (I believe I saw it in Laura Gasparis' CCRN review videos) this rough formula to predict the change in serum potassium given an anticipated change in pH (all other things being equal). i.e. if your pH is 7.18 and your serum K is 5.2 and you correct your pH to 7.38 what will the change in serum K be?
I used to know it, and anecdotally it was usually right on the money when I used it. Trying to help a colleague work a clinical problem right now.
Jul 7, '12
The answer to your question is for every change in ph by 0.1 tha K will change by 0.6 in the opposite direction.
Hope that helps!