It's fascinating to learn about the what is customary practice in other countries. Joint Commission and sentinel events at several hospitals in the US involving problems with RNs adding K+ to IV's has resulted in it being removed from stock on nursing units in both the large NYC hospital where I know work and the much smaller community hospital where I previously worked. It is not a matter of adequate pharmacy coverage, it's a matter of retaining your accreditation and licensure. This has all occurred in the northeast US in the past four years. So this is a fairly recent change in practice. But getting back to the Pedi question: the answer is "pee" before KCl.