Free ASCP PBT Practice Quiz
Question 1 of 10
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A nurse asks you to redraw a chemistry panel because the prior potassium resulted at 7.2 mEq/L on a patient with no cardiac or renal history. Reviewing the previous draw, you see the sequence was: gold SST, then lavender EDTA, then green lithium heparin. What is the most likely pre-analytical cause of the spurious hyperkalemia?
Order of Draw & Additive Interference