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Test Code LABAXLMPK Anti Xa LMWH (Enoxaparin), *Exact Time Required* 4 Hr Post

Synonym

  • AXLMWHPK
  • Low molecular weight heparin
  • LMWH Peak

Specimen Required

Preferred Container/Tube: 3.2% Citrate Blue Top - 2.7 mL
Specimen Volume: 2.7 mL
Acceptable Container/Tube: 3.2% Citrate Blue Top - 1.8 mL
Specimen Volume: 1.8 mL
Platelet poor plasma (PPP):
Specimen Volume: 2 - 1 mL aliquots platelet poor plasma (PPP)
Specimen Minimum Volume: 1 - 1 mL aliquot platelet poor plasma (PPP)

Specimen Collection Information

Samples from outreach locations must be received as frozen plasma.  

For sending frozen specimens, process specimens immediately upon collection. Centrifuge capped specimen tube at a speed and time required to consistently produce platelet-poor plasma (platelet count <10 K/uL). Check cells for clot. Do not send for testing if the sample is clotted. Transfer plasma into 2 plastic aliquot tubes and freeze. DO NOT transport until specimens are completely frozen. 

Note: All specimens transported as frozen plasma must remain frozen in transit. 

Specimen Stability Information

Ambient: 
     Whole blood: 1 hours
     Platelet poor plasma: 2 hours
Frozen: 
      Platelet poor plasma: PPP removed from the cells and frozen at -20°C or ideally -70°C.

Rejected Due To

  • Ambient WB specimens >1 hour old
  • Ambient PPP specimens >2 hours old
  • Clotted specimens
  • Underfilled or overfilled tube
  • Hemolysis
  • Icterus
  • Lipemia

Reference Values

0.60-1.00 Anti-Xa IU/mL

Cautions

Test is not indicated if the patient is receiving unfractionated heparin or other Anti-Xa drugs.

Method Description

Chromogenic measurement at 405nm

Performing Lab

Clinical Lab UH

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 day

Reporting Name

Anti Xa LMWH (Enoxaparin) 4 Hr Post

CPT Code Information

85520

LOINC Code Information

3271-4