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Test Code HEPUN Heparin Unfractionated Anti-Xa

Additional Codes

Epic: LAB2319

Specimen Required

Send only one of the following


Specimen Type: Platelet-poor plasma

Collection Container/Type: Light-blue top (3.2% sodium citrate)

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions: 

  1. Within 1 hour of collection, centrifuge, transfer all plasma into a plastic vial, and centrifuge plasma again.
  2. Aliquot plasma into separate plastic vial leaving 0.25 mL in the bottom of centrifuged vial.
  3. Freeze plasma immediately (no longer than 2 hours after collection).
  4. For complete instructions, see Platelet Poor Plasma Instructions.


Specimen Type: Whole Blood

Collection Container/Type: Light-blue top (3.2% sodium citrate)

Submission Container/Tube: Light-blue top tube

Specimen Volume: 2.7 mL

Specimen Stability

Platelet-poor plasma

Room temperature: 2 hours

Refrigerated: Unacceptable

Frozen (<-20°C): 2 weeks


Whole Blood

Room temperature: 1 hour

Refrigerated: Unacceptable

Frozen (<-20°C): Unacceptable

Reference Range

See laboratory report.

Report Available

1 day


Unfractionated Heparin (UFH)

Low Molecular Weight Heparin (LMWH)


Day(s) Performed

Monday - Friday