Template:Age Adjusted D-dimer usage

Labs commonly report the test as fibrinogen equivalent units (FEUs) with the cutoff at 500 ng/mL and most studies used the FEU values for derivation or validation. If reported by the lab as a D-dimer unit (DDU) the cutoff is often 230 ng/mL. 2 FEUs equal 1 DDU.

  • Age (years) x 10 ug/L for patients > 50 years of age
    • Patient age 75 = age adjusted d-dimer of 750 ug/L
  • If using a lab with a cutoff of 230 (DDU assay) then formula is Age x 5
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