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Alias Names: Dalteparin / Fragmin / Factor X Inactivation / Factor Xa, Low Molecular Weight Heparin / Anticoagulant Monitoring, Low Molecular Weight Heparin
Methodology: Chromogenic Measurement of Factor Xa Inactivation
Edit Date: 1/29/2008
Performed: Daily
Released: 24 hours
CPT Code: 85520
Specimen Collection Details
Collection: One 4.5 mL light blue top tube (sodium citrate). Collect by careful venipuncture to avoid tissue fluid contamination or hemolysis. Do not use needles smaller than 23 gauge. Fill tube to maximum draw, at least 90% full. Mix by gentle inversion. Draw 3-4 hours after LMW heparin dose.
Handling: Keep capped and refrigerate in original tube if specimen will be received at the laboratory within 6 hours. If not, centrifuge to produce platelet-poor plasma (at least 1700 X G for 15 minutes) and transfer the top 2/3 of the plasma with a plastic pipette into a plastic vial, and freeze quickly. Label with patient name, test, and ‘plasma.’ If multiple tests are ordered, freeze a separate aliquot for each test. Send to laboratory within one month.
Stability: 2 hours ambient, 8 hours refrigerated, or 1 month frozen.
Standard Volume: 5 mL whole blood or 2 mL plasma.
Minimum Volume: 1.8 mL whole blood or 0.5 mL plasma.
Transport: Original tube refrigerated if received in laboratory within 6 hours of collection, or plasma frozen on dry ice in a Styrofoam container.
Comments: Dalteparin is sold as ‘Fragmin’ (proprietary synonym)
Rejection Criteria: Serum; visible fibrin; moderate to marked hemolysis; specimen age.

Therapeutic Range:
once/day subcutaneous dosing 1.0-2.0 U/mL measured 4-5 hours post-injection
twice/day subcutaneous dosing 0.5-1.1 U/mL measured 4-5 hours post-injection

PeaceHealth Laboratories