CDOS

D-Dimer

Test Code: 115188

Performing Lab: LabCorp

CPT Code: 85379 001

Test Link (Copy)

Specimen Type

Plasma, FROZEN

Specimen Container

Blue-top (sodium citrate) tube

Volume

2 mL

Minimum Volume

1 mL

Specimen Handling

Citrated plasma samples should be collected by double centrifugation. Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate.[1] Evacuated collection tubes must be filled to completion to ensure a proper blood to anticoagulant ratio.[2,3] The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood. A discard tube is not required prior to collection of coagulation samples.[4,5] When noncitrate tubes are collected for other tests, collect sterile and nonadditive (red-top) tubes prior to citrate (blue-top) tubes. Any tube containing an alternate anticoagulant should be collected after the blue-top tube. Gel-barrier tubes and serum tubes with clot initiators should also be collected after the citrate tubes. Centrifuge for 10 minutes and carefully remove 2/3 of the plasma using a plastic transfer pipette, being careful not to disturb the cells. Deliver to a plastic transport tube, cap, and recentrifuge for 10 minutes. Use a second plastic pipette to remove the plasma, staying clear of the platelets at the bottom of the tube. Transfer the plasma into a Labcorp PP transpak frozen purple tube with screw cap (Labcorp No 49482). Freeze plasma immediately and maintain frozen until tested. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Unacceptable Conditions

Gross hemolysis; clotted specimen; specimen thawed in transit; improper labeling; samples stored unfrozen for more than 8 hours.

Temperature

Freeze (Unless testing performed within 8 hours of collection)24

Methodology

Immunoturbidimetric Assay

Stability

Room Temperature: 8 hours
Refrigerated: 8 hours
Frozen: 4 weeks

Result Code	Result Name	LOINC
115206	D-Dimer	48065-7

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