D-dimer
1 ng/mL = 1 µg/L | 1 ng/mL = 0.002 mg/L FEU | 1 ng/mL = 0.001 µg/mL DDU
FEU (Fibrinogen Equivalent Units) vs DDU (D-Dimer Units). 1 mg/L FEU ≈ 0.5 µg/mL DDU.