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Test Code ANTIXA Heparin Anti Xa Assay, Plasma, LAB2513

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements

Container/Tube:

Preferred: Full blue-top (sodium citrate) 1.8 mL tube-Hemolyzed or short draw specimen is not acceptable.
Specimen Volume: 0.5 mL sodium citrate plasma

Stability: Centrifuged specimens at 2-4°C or at 15-25°C must be tested within 8 hours of specimen collection.

Collection Instructions: Centrifuge immediately after draw. Forward promptly. If there is a delay in transport of> 8 hours or if mailing time exceeds 8 hours, spin down, remove plasma from cells and freeze immediately in plastic vial. Send specimen frozen. Specimen stability is 1 month at -20° C.

 

NOTE:  Patients with a hematocrit of> 55% must be recollected using an altered amount of sodium citrate.

Reference Values

0.30-0.70 iu/mL

 

Critical value:  ≥1.05 IU/mL

Useful For

Useful in monitoring Unfractionated Heparin used for heparin therapy

Day(s) Test Set Up

Monday through Sunday

Methodology

Chromogenic assay

Test Classification and CPT Coding

85520