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Labcorp Oklahoma, Inc.
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Factor 10a (Xa) Inhibition, Low Molecular Weight Heparin (LMWH)

Order Name LMWHEPARIN
Test Number: 1506175
Revision Date 08/26/2014
Test Name Methodology LOINC Code
Factor 10a (Xa) Inhibition, Low Molecular Weight Heparin (LMWH)
Chromogenic 32684-3 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 2.7 mL Whole Blood Sodium Citrate 3.2% (Blue Top) Room Temperature
Alternate 1 1.5 mL Double Spun Plasma Sterile, Capped Plastic Tube Frozen
Instructions Please indicate anticoagulant therapy.
Each 2.7mL Sodium Citrate 3.2% (Blue Top) tube must be filled to the proper level, no hemolysis. Improperly filled tubes can give erroneous results.
Specimen should be collected at least 4 hours after subcutaneous injection.

Whole blood must be transported to SJMC lab within 1 hour of collection. If testing cannot be started within 1 hour of collection the specimen must be double spun then 1.5mL plasma aliquot from each tube into individual plastic aliquot tubes and freeze.  Do not pool aliquots together!
GENERAL INFORMATION
Testing Schedule Daily 
Expected TAT 1 Day  
Clinical Use The assesment of the anti-Xa effect of heparin by this method gives a high sensitivity in detecting Low Molecular Weight Heparin levels. 
CPT Code(s) 85520
Lab Section Coagulation