Question

A 50-year-old woman with suspected PE is low-intermediate risk by Wells and age 60. D-dimer assay reports fibrin equivalent units (FEU). Which cutoff can be used to exclude PE?

Accepted Answer

Age-adjusted cutoff of age × 10 µg/L (e.g., 600 µg/L for age 60)

Answer

Fixed cutoff 250 µg/L for all ages

Answer

Age-adjusted cutoff of age × 5 µg/L for FEU

Answer

No adjustment; all older adults require CT

Answer

Use PERC only regardless of D-dimer

Practice question

A 50-year-old woman with suspected PE is low-intermediate risk by Wells and age 60. D-dimer assay reports fibrin equivalent units (FEU). Which cutoff can be used to exclude PE?