D Dimer Quantitative 
Mnemonic D DIMER
CPT 85379
Test Code 2500230
Test Includes  
Specimen Plasma
Volume 1.0 mL
Container Light Blue Top (3.2% Sodium Citrate) Tube
Special Instructions For patients with hematocrits >55%, please see Specimen Collection and Handling - Coagulation Procedures or contact WDL Coagulation Department at 414-805-8428.
Specimen Prep Centrifuge* at 3500 rpm for 15 minutes within 4 hours of collection. Transfer the top 2/3 of plasma to a plastic transport tube and centrifuge again at 3500 rpm for 15 minutes. Transfer the top cell-free plasma to clean plastic transport tubes in 1-mL aliquots and label tubes as "CITRATE PLASMA". FREEZE IMMEDIATELY and maintain frozen until tested.
Storage Freeze
Transport Temp Plasma: Frozen
Stability Rm Temp  4 hours in original light blue top tube.
Stability Refrig Do Not Refrigerate.
Stability Frozen 1 month frozen at -70 degrees celcius, 2 weeks at -20 degrees celcius 2 hours once thawed
Methodology Quantitative Immuno-Turbidometric
Rejection Criteria Underfilled, overfilled or clotted tubes. Hemolyzed, lipemic or icteric plasma. 
Reference Value 0 - 0.6 mg/L FEU 
Performed/TAT Monday - Sunday        
Comments Submit separate samples when requesting multiple tests on the same specimen. This is a quantitative test for D-Dimer. This assay has been cleared as an aid in the diagnosis of deep vein thrombosis (DVT) & pulmonary embolism (PE). It is recommended it only be used for this purpose in the outpatient setting. At a cut-off of 0.5 mg/L FEU the negative predictive value is 98% for DVT or PE with a sensitivity of 97% and specificity of 42%.