Cardio-specific troponins (i.e., cTnl and cTnT) have become the mainstay for diagnosing and monitoring myocardial damage (1, 2). However, false-positive results for cTnl have been reported, primarily caused by interferents, such as heterophilic antibodies, rheumatoid factor, macrocomplexes, hemolysis and fibrin (3-5). Recently, falsely elevated cTnl attributed to inadequate centrifugation have been reported (6). We have observed another potential source of false positive results attributed to collection tubes.
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