ARUP's Laboratory Test Directory

0030143: Heparin Anti-Xa, Unfractionated

Test Mnemonic: HA UN
Methodology: Chromogenic Assay/Inhibition of Xa

Performed: Sun-Sat

Reported: Within 24 hours

Specimen Required:  
Collect: One 5 ml lt. blue (3.2% sodium citrate).  Refer to the Hemostasis/Thrombosis Specimens section in the front of this User's Guide for specimen collection instructions. 

Transport: 2 mL platelet-poor plasma, frozen.  (Min: 1.0 mL)

Pediatric Collection/Transport: 1 mL platelet-poor plasma, frozen.

Remarks: Record heparin type on test request form.  Sample should be centrifuged within one hour of collection.

Unacceptable Conditions: Serum, hemolyzed samples, EDTA, oxalate, heparin, PST tubes, and samples refrigerated more than eight hours.

Stability: After separation from cells: Ambient: 4 hours; Refrigerated: 8 hours; Frozen: 1 month

Reference Interval:
0.35-0.70 U/mL

CPT Code(s):
85520

 

 

 
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