Read the finding
Haematology · Pattern recognition
Coagulation screen
5 findings. Cover the answers and work down the list — then flip it and predict the finding from the diagnosis.
Raised APTT, normal PTHaemophilia / VWD / heparin
Raised PT, normal APTTWarfarin (early) / factor VII / liver disease
Raised PT + raised APTT + low fibrinogen + high D-dimerDisseminated intravascular coagulation
Isolated low platelet count with normal PT and APTTImmune thrombocytopenia (ITP)
Prolonged APTT that does NOT correct on mixing, with thrombosisAntiphospholipid syndrome (lupus anticoagulant)