Heparin Unfractionated Anti Xa Level

Abbrev Code:AAUFH   
Order Code:LAB8132Order Name:Heparin Unfractionated Anti Xa Level
Synonyms:Heparin Xa; Heparin Level; Anti 10A; Anti Xa; UFH Anti 10A Level; UFH Anti Xa Level
Methodology:Chromogenic (synthetic substrate) activity assay
CPT Codes: 85520 x1
Turnaround Time:Performed and reported 24 hours/day
Associated Links:

Specimen Collection and Processing for Coagulation Specimens

Collection Instructions

Optimal Volume:2.7 mL (in 3 mL tube) - filled to fill line on the tube.
Minimum\Peds Volume:1.8 mL (in 2 mL tube) - filled to fill line on the tube.
Container:Blue Na Citrate, 3.2% - fill to fill line on tube
Collection Instructions:If the patient's hematocrit is >55%, contact laboratory to obtain a special tube. If using a butterfly needle, a waste tube must be collected before the blue top tube.
After Care:If the patient has a coagulation abnormality, apply direct pressure to the puncture site for 10 minutes; apply a pressure dressing. Instruct the patient to leave the bandage on for 12 hours.
Causes for Rejection:Underfilled tubes, overfilled tubes, clotted specimens, specimen collected in 3.8% buffered citrate. Whole blood specimen greater than 2 hours old, or not processed appropriately within 1 hour of collection.

Processing and Shipping

Specimen Processing:Must be processed within 1 hour of collection. See Associated Links for additional processing instructions.
Shipping Instructions:Ship processed plasma on dry ice. Must arrive within 48 hours.
Test Performed at or Referral Lab Coagulation  (Grand Itasca, Lakes, Northland, Range, Ridges, Southdale, St. John's, UMMC East Bank, UMMC/UMMCH-West Bank, Woodwinds)


Critical Range:>1.10 IU/mL
Therapeutic Range:If collected 4-6 hours after administration:
0.25-0.50 IU/mL for low intensity dosing;
0.30-0.70 IU/mL for high intensity dosing for DVT and PE.
Use:Estimate the concentration of physiologically active heparin anticoagulant (anti-Factor Xa activity) in plasma.

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