Test directory: D-Dimer, Quantitative

Ordering Code581
Test NameD-Dimer, Quantitative
Thrombo-Wellco Test
Preferred SpecimenPlasma
Preferred ContainerCitrate, 3.2% (Lt Blue)
Other Specimen/ContainerWhole Blood in Citrate, 3.2% (Lt Blue) if testing is done within 4 hours.
Optimum Volume1 mL
Collection InstructionsDraw full tube
Mix tube well
Handling InstructionsDouble centrifuge plasma, separate, and freeze at -20 deg. C immediately. Do NOT thaw once specimen is frozen.
Transport RequirementsPreferred method of transport is frozen plasma.
Specimen StabilityAmbient: 4 Hours Whole Blood (unopened tube)
Ambient: 8 Hours Plasma
Refrigerated: Not Stable
Frozen: 2 Weeks Plasma
Rejection CriteriaClotted, Contaminated, Hemolyzed,
Improperly filled or underfilled tube,
Specimen older than stability limits
Avail. StatYES
Analytic Time1 Day
MethodologyLatex agglutination

Reference range(s)

ComponentAgeMale NormMale Critical LowMale Critical HighFemale NormFemale Critical HighFemale Critical LowUnitsAdd'l info
D-Dimer, QuantitativeALL< 0.50< 0.50ug/mL FEU
D-dimer values <0.50... D-dimer values <0.50 ug/mL fibrinogen equivalent units (FEU) are normal

This assay may be used in conjunction with a clinical pre-test probability (PTP) assessment model to exclude pulmonary embolism (PE). A normal D-dimer result (<0.50 ug/mL FEU) using this assay has a negative predictive value of approximately 99% for the exclusion of acute PE in a low-moderate PTP patient population
This assay may be used as an aid in the diagnosis of DVT. A normal D-dimer result (<0.50 ug/mL FEU) using this assay has a negative predictive value of 95-100%
A thromboembolic event should not be excluded solely on the basis of the D-dimer level. Results of this test must be interpreted in conjunction with the patient's medical history and clinical presentation.