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Summarizing the effect of direct oral anticoagulants (DOACs) on the activated partial thromboplastin time (aPTT). An original figure highlighting historical data in which the lead author performed in collaboration with the Royal College of Pathologists of Australasia Quality Assurance Program (RCPQAP) 64 , 65 and showing differential effects on various commercial aPTT reagents according to type of DOAC. The aPTT data are shown as APTT ratios
