Question

A 62-year-old with suspected DVT has low pretest probability. A high-sensitivity D-dimer is 540 ng/mL FEU; he is 65 years old. Which interpretation is correct?

Accepted Answer

Negative by age-adjusted threshold (≤650 ng/mL)

Answer

Positive-≥500 ng/mL is positive for all ages

Answer

Indeterminate-repeat in 24 h

Answer

Positive because threshold is age×5 (325 ng/mL)

Answer

Cannot use D-dimer in low-risk patients

Practice question

A 62-year-old with suspected DVT has low pretest probability. A high-sensitivity D-dimer is 540 ng/mL FEU; he is 65 years old. Which interpretation is correct?