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  (Range, UMMC-East Bank, Lakes, Ridges, Northland, Southdale, UMMC/UMMCH-West Bank, Grand Itasca, St. Joseph's, St. John's, 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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