Factors that can cause false-negative<unk> 
Symptoms of PE > 3 days
Small PE
Use of qualitative latex fixation test
Use of anticoagulants
Factors that can cause false-positive<unk> 
Cancer and malignancy
Recent surgery
Infection (eg, pneumonia, sepsis)
Pregnancy
Age > 70 years
DIC
Trauma
Arterial thrombosis
ACS/AMI
Vaso-occlusive sickle cell crisis
Acute CVA
Vasculitis
Superficial phlebitis
Symptoms of PE > 3 days
Small PE
Use of qualitative latex fixation test
Use of anticoagulants
Cancer and malignancy
Recent surgery
Infection (eg, pneumonia, sepsis)
Pregnancy
Age > 70 years
DIC
Trauma
Arterial thrombosis
ACS/AMI
Vaso-occlusive sickle cell crisis
Acute CVA
Vasculitis
Superficial phlebitis
D-dimer
Factors that can cause false-negative D-dimer
Cardiac enzymes
Symptoms of PE > 3 days
Troponin
Small PE
Brain natriuretic peptide
Use of qualitative latex fixation test