Question

A 66-year-old with suspected PE is PERC positive but low probability. Age 66. Which D‑dimer threshold is appropriate?

Accepted Answer

Use age‑adjusted threshold (age ×10 ng/mL for assays with 500 ng/mL cutoff)

Answer

Use fixed 250 ng/mL for all

Answer

Do not order D‑dimer in low risk

Answer

Always proceed to CTPA regardless

Answer

Use Wells ×100 as threshold

Practice question

A 66-year-old with suspected PE is PERC positive but low probability. Age 66. Which D‑dimer threshold is appropriate?