Reda S, Schwarz N, Muller J, Oldenburg J, Potzsch B, Ruhl H. Impaired <i>in vivo</i&gt; activated protein C response rates indicate a thrombophilic phenotype in inherited thrombophilia. Haematologica 2022;107(5):1197-1200; https://doi.org/10.3324/haematol.2021.280573.