TNNI3 and myocardial infarction: A single‐sample rule‐out threshold for the Atellica VTLi hs‐cTnI assay was derived using whole blood (Safe Emergency Department Discharge Rate, NCT04772157; n = 1086 patients; incidence of myocardial infarction 8.1%) and subsequently validated using stored plasma (Suspected Acute Myocardial Infarction in Emergency, ACTRN12621000053820; n = 1486 patients; incidence of myocardial infarction 5.5%).