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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

Sample MUST be filled to indicated line on blue top tubes for proper blood:anticoagulant ratio (9:1). Do not fill past the bottom of the cap to avoid rejection for being too full (>9:1 ratio).

 

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. 

 

For OSU Outpatient sites: Anti-Xa testing can only be collected at approved outpatient locations due to processing requirements. View approved sites: Time and Temperature-Sensitive Test Collection by Location - The Ohio State Wexner Medical Center Labs Test Catalog

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