Algorithm for Acquired Haemophilia A diagnosis and monitoring. *One-stage clotting assay and/or chromogenic substrate assay. **Only required if treatment with susoctocog alfa is available locally. AHA, acquired haemophilia A; APTT, activated partial thromboplastin time; CSA, chromogenic substrate assay; DOAC, direct oral anticoagulant; FVIII, factor VIII; FX, factor X; LA, lupus anticoagulant; OSCA, one-stage clotting assay; res.FVIII, residual FVIII; rpFVIII, susoctocog alfa; VII:VWF-Ag, factor VIII to von Willebrand factor antigen ratio; VWF, von Willebrand factor.