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Anti Factor Xa, Plasma

Important Note

Direct oral anticoagulants which inhibit Factor Xa (rivaroxaban, apixaban, edoxaban) positively interfere with this test (e.g. anti-Xa DOACs prescribed concurrently with LMWH or UFH can produce a falsely elevated LMWH/UFH activities). Severe antithrombin deficiency (less than 50%) can cause falsely low LMWH/UFH activities.

Additional Codes

Epic# -

LAB5416

 

Cerner name(s):

  • Anti Factor Xa
  • Anti FacXa

Performing Lab(s)

Memorial-Belleville & Memorial-Shiloh

Specimen Requirement (s)

Specimen Type: plasma

Container/Tube:   light blue 3.2% buffered NaCitrate tube

Specimen Volume:     Tube must be filled to line on tube

Specimen Minimum Volume:  Tube must be filled to line on tube

 

Collection Instructions: NA

Unacceptable Conditions

  • Samples that are short draws (<90% of the tube filled).
  • Overfilled (>110% of tube filled)
  • Clotted
  • Hemolyzed
  • Mislabeled
  • Received > 1 hour post draw time.

Day(s)/Shift(s) Test Set Up and Turnaround Time

Sunday through Saturday

Hours: 24 hours 

 

Turnaround Time:

STAT: 60 minutes

Routine: less than 8 hours from receipt.

Transport and Stability

Transport temperature: Refrigerated

 

Analyte Stability: 

Ambient: 2 hours (If testing must be delayed, remove plasma as soon as possible from the cells and freeze)

Refrigerated: NA

Frozen: 1 month

CPT/LOINC Codes

85520