Question

A 68-year-old with low pretest probability for PE has D‑dimer measured in fibrinogen equivalent units (FEU) of 650 ng/mL. According to ACEP, how should an age‑adjusted D‑dimer be interpreted?

Accepted Answer

Negative if < age × 10 (FEU)

Answer

Positive because >500 regardless of age

Answer

Negative if < age × 5 (FEU)

Answer

Indeterminate; proceed to CT angiography

Answer

Use D‑dimer DDU units only for age adjustment

Practice question

A 68-year-old with low pretest probability for PE has D‑dimer measured in fibrinogen equivalent units (FEU) of 650 ng/mL. According to ACEP, how should an age‑adjusted D‑dimer be interpreted?