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  ANTI-XA Assay Specimen Type:
  also known as Anti-XA Assay, Heparin Assay, Heparin Assay by XA Inhibition, Heparin level



Specimen requirements: Blue Top
Unit of measure: U/mL
Ideal sample: 2.7 mL Whole Blood, blue top tube
Absolute minimum amount: 2.4 mL Whole Blood, blue top tube
Method of collection: N/A
Transportation: Must be received in lab within 30 minutes of venipuncture.
Label instructions: N/A
The following substances can adversely affect the results: Clots in Specimen, Improper Line Draw, Hemolysis
Request test on form: Special Coagulation ( D6115 )
Order/entry screen(s): Hematology/Coagulation
Stat frequency: N/A
Stat turn around time: N/A
Routine frequency: Monday - Friday, 0830-1630
Must be in by: 1500
Routine turn around time: 24 Hours
For Hillcrest deliver to: SCRAP : Specimen Central Receiving and
  Processing, room 2-117
For Thornton deliver to: Deliver to hematology, processing desk, 1st floor hospital room 1-103
Scheduling requirements : Samples may be drawn at any time appropriate for the patient's heparin dosage schedule, but must be processed as below within one hour of collection and frozen immediately after processing.  Samples must remain frozen until time of assay.
Method: Chromogenic Substrate
Special Instructions: Canned Message:  HEPXA, Call ext 32324 (Hillcrest) or ext. 76164 (Thornton)

Do not draw from heparinized line. 1) Test is performed only when approved by pharmacist or pregnant, renal, or obese patients or infants. 2) Type of heparin patient is receiving must be specified. 3) Sample should be collected 4 hr post dose for patients receiving low molecular weight heparin (enoxaparin/lovenox). 4) Plasma must be removed from cells within 1 hr of collection and should be double spun to ensure removal of all platelets. 5) Plasma must be frozen if the assay is not run within two hours of collection.

6) Notify lab before sending:  Hillcrest:  619.543.2324  or  Thornton:   858.657.6164

  Results are available on a Chart Copy
  Results are Quantitative
SOFT abbreviation: HEPXA
Lab Processing Instructions: N/A