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Test Code 1078802899 Anti-Xa Unfractionated Heparin

Important Note

Listing in process - please contact lab

Performing Laboratory

Torrance Memorial Laboratories

Specimen Requirements

Submit the following specimen:

Specimen Type:  Platelet-poor plasma.  Frozen samples must be double spun

Container/Tube: Light-blue top (3.2% sodium citrate)

Minimum volume: 1 mL plasma

Rejection:  Clotted, wrong anticoagulant, under or over-filled, gross hemolysis, gross lipemia, gross icteric

Specimen Transport Temperature

Ambient

Storage Temp Stability:

Ambient: 2 hours

Frozen:  14 days

Methodology

1-stage chromogenic assay.  Performed on Instrumentation Laboratory ACL TOP 500

Reference Range

0.30 - 0.70 IU/mL

Interpretive Data:

Heparin Anti-Xa assay is used to measure heparin concentrations in patients receiving unfractionated heparin or low-molecular-weight heparin. 
Very low endogenous antithrombin III (AT III) levels might result in spuriously-low results.  
Antibodies to bovine factor X or AT III can interfere with assay (very rare). This is not a test for the presence of inhibitors directed against factor X.

 

Day(s) Test Set Up/TAT

Performed:

Daily 

Available STAT

 

TAT:

STAT: < 1 hr

Routine: < 4 hrs

Aliases

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CPT Code

85520